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			</style>[an error occurred while processing this directive]<div class="content-width"><ol class="breadcrumb text-uppercase"><li><a href="/">Home</a></li><li><a href="/aboutus/">About Us</a></li><li><a href="/people/">People</a></li><li><a href="/people/emeritusfaculty.html">Emeritus Faculty</a></li><li><a href="/people/Georg.Gottlob"><span itemprop="name">Georg Gottlob</span></a></li><li class="active">Publications</li></ol></div><!-- MOBILE NAVIGATION --><div class="content-width space-below mobile-menu-placeholder visible-xs visible-sm"></div><!-- COLUMNS --><div class="container-fluid content-width"><div class="row"><div class="col-xs-12 col-md-9 col-md-push-3" id="maincontent"><!-- CONTENT (Column 2) --><div class="page-title"><h1>Georg Gottlob : Publications
</h1></div><div role="toolbar" class="btn-toolbar"><div class="btn-group"><a href="/people/publications/date/Georg.Gottlob.html" aria-hidden="true" type="button" class="btn btn-oxford-blue"><span class="glyphicon glyphicon-sort-by-attributes"></span> By date</a><a href="/people/publications/title/Georg.Gottlob.html" aria-hidden="true" type="button" class="btn btn-default"><span class="glyphicon glyphicon-sort-by-attributes"></span> By title</a><a href="/people/publications/type/Georg.Gottlob.html" aria-hidden="true" type="button" class="btn btn-default"><span class="glyphicon glyphicon-sort-by-attributes"></span> By type</a><a href="/people/publications/bibtex/Georg.Gottlob.html" aria-hidden="true" type="button" class="btn btn-default"><span class="glyphicon glyphicon-file"></span> BibTex</a></div></div><p></p><ul class="list-unbulleted list-unbulleted-spaced"><li>
	
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	<p class="publicationTitle"> <strong>
            Democratizing Financial Knowledge Graph Construction by Mining Massive Brokerage Research Reports </strong> </p>
	    <p class="publicationAuthors"> <em> Zehua Cheng&#x201a; Lianlong Wu&#x201a; Thomas Lukasiewicz&#x201a; Emanuel Sallinger and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Maya Ramanath and Themis Palpanas, editors,
             
            <em>
            Proceedings of the Workshops of the EDBT/ICDT 2022 Joint Conference&#x201a; Edinburgh&#x201a; UK&#x201a; March 29&#x201a; 2022</em>.
        
            Vol. 3135
                of CEUR Workshop Proceedings.
        CEUR&#x2212;WS.org.
        2022.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication15643-abstract.html">
			Details <span class="sr-only" > about <em> Democratizing Financial Knowledge Graph Construction by Mining Massive Brokerage Research Reports  </em></span> </a> |
			<a href="/publications/publication15643.bib">
			BibTeX  <span class="sr-only" > data for <em> Democratizing Financial Knowledge Graph Construction by Mining Massive Brokerage Research Reports  </em></span>   </a>
			
			
					| <a href="http://ceur-ws.org/Vol-3135/EcoFinKG\_2022\_paper5.pdf"> Download (pdf)  <span class="sr-only" > of <em> Democratizing Financial Knowledge Graph Construction by Mining Massive Brokerage Research Reports  </em></span>   </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Stable Model Semantics for Guarded Existential Rules and Description Logics: Decidability and Complexity </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Andr&#xe9; Hernich&#x201a; Clemens Kupke and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Journal of the ACM</em>.
        
            Vol. 68.
        
            No. 5.
        
                Pages 35:1&#x2013;87.
            October,
            2021.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication14500-abstract.html">
			Details <span class="sr-only" > about <em> Stable Model Semantics for Guarded Existential Rules and Description Logics: Decidability and Complexity  </em></span> </a> |
			<a href="/publications/publication14500.bib">
			BibTeX  <span class="sr-only" > data for <em> Stable Model Semantics for Guarded Existential Rules and Description Logics: Decidability and Complexity  </em></span>   </a>
			
			
					| <a href="https://doi.org/10.1145/3447508"> Link <span class="sr-only" > to <em> Stable Model Semantics for Guarded Existential Rules and Description Logics: Decidability and Complexity  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Stable Model Semantics for Guarded Existential Rules and Description Logics </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Andr&#xe9; Hernich&#x201a; Clemens Kupke and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Chitta Baral and Giuseppe De Giacomo, editors,
             
            <em>
            Proceedings of the 14th International Conference on the Principles of Knowledge Representation and Reasoning&#x201a; KR 2014&#x201a; Vienna&#x201a; Austria&#x201a; July 20&#x2212;24&#x201a; 2014</em>.
        
                Pages 258&#x2212;267.
            AAAI Press.
        July,
            2014.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication8443-abstract.html">
			Details <span class="sr-only" > about <em> Stable Model Semantics for Guarded Existential Rules and Description Logics  </em></span> </a> |
			<a href="/publications/publication8443.bib">
			BibTeX  <span class="sr-only" > data for <em> Stable Model Semantics for Guarded Existential Rules and Description Logics  </em></span>   </a>
			
			
					| <a href="http://www.aaai.org/ocs/index.php/KR/KR14/paper/view/8011"> Link <span class="sr-only" > to <em> Stable Model Semantics for Guarded Existential Rules and Description Logics  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Expressive Languages for Querying the Semantic Web </strong> </p>
	    <p class="publicationAuthors"> <em> Marcelo Arenas&#x201a; Georg Gottlob and Andreas Pieris  </em> </p>
	
	<p class="publicationDetails"> 
            In Georg Gottlob and Jorge P&#xe9;rez, editors,
             
            <em>
            Proceedings of the 8th Alberto Mendelzon Workshop on Foundations of Data Management&#x201a; Cartagena de Indias&#x201a; Colombia&#x201a; June 4&#x2212;6&#x201a; 2014</em>.
        
            Vol. 1189
                of CEUR Workshop Proceedings.
        CEUR&#x2212;WS.org.
        2014.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication10372-abstract.html">
			Details <span class="sr-only" > about <em> Expressive Languages for Querying the Semantic Web  </em></span> </a> |
			<a href="/publications/publication10372.bib">
			BibTeX  <span class="sr-only" > data for <em> Expressive Languages for Querying the Semantic Web  </em></span>   </a>
			
			
					| <a href="http://ceur-ws.org/Vol-1189"> Link <span class="sr-only" > to <em> Expressive Languages for Querying the Semantic Web  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Datalog+&#x2044;&#x2212;: Questions and Answers </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Thomas Lukasiewicz and Andreas Pieris  </em> </p>
	
	<p class="publicationDetails"> 
            In Chitta Baral and Giuseppe De Giacomo, editors,
             
            <em>
            Proceedings of the 14th International Conference on the Principles of Knowledge Representation and Reasoning&#x201a; KR 2014&#x201a; Vienna&#x201a; Austria&#x201a; July 20&#x2212;24&#x201a; 2014</em>.
        
                Pages 682&#x2212;685.
            AAAI Press.
        2014.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication8897-abstract.html">
			Details <span class="sr-only" > about <em> Datalog+&#x2044;&#x2212;: Questions and Answers  </em></span> </a> |
			<a href="/publications/publication8897.bib">
			BibTeX  <span class="sr-only" > data for <em> Datalog+&#x2044;&#x2212;: Questions and Answers  </em></span>   </a>
			
			
					| <a href="http://www.aaai.org/ocs/index.php/KR/KR14/paper/view/7965"> Link <span class="sr-only" > to <em> Datalog+&#x2044;&#x2212;: Questions and Answers  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Query Answering under Probabilistic Uncertainty in Datalog+&#x2044;&#x2212; Ontologies </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Thomas Lukasiewicz&#x201a; Maria Vanina Martinez and Gerardo I. Simari  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Annals of Mathematics and Artificial Intelligence</em>.
        
            Vol. 69.
        
            No. 1.
        
                Pages 37&#x2212;72.
            September,
            2013.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication6562-abstract.html">
			Details <span class="sr-only" > about <em> Query Answering under Probabilistic Uncertainty in Datalog+&#x2044;&#x2212; Ontologies  </em></span> </a> |
			<a href="/publications/publication6562.bib">
			BibTeX  <span class="sr-only" > data for <em> Query Answering under Probabilistic Uncertainty in Datalog+&#x2044;&#x2212; Ontologies  </em></span>   </a>
			
			
					| <a href="http://dx.doi.org/10.1007/s10472-013-9342-1"> Link <span class="sr-only" > to <em> Query Answering under Probabilistic Uncertainty in Datalog+&#x2044;&#x2212; Ontologies  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Semantic Web Search and Inductive Reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Claudia d'Amato&#x201a; Nicola Fanizzi&#x201a; Bettina Fazzinga&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Fernando Bobillo&#x201a; Paulo Cesar G. da Costa&#x201a; Claudia d'Amato&#x201a; Nicola Fanizzi&#x201a; Kathryn B. Laskey&#x201a; Kenneth J. Laskey&#x201a; Thomas Lukasiewicz&#x201a; Matthias Nickles and Michael Pool, editors,
             
            <em>
            Uncertainty Reasoning for the Semantic Web II&#x201a; International Workshops URSW 2008&#x2212;2010&#x201a; Held at ISWC&#x201a; and UniDL 2010&#x201a; Held at FLoC&#x201a; Revised Selected Papers</em>.
        
            Vol. 7123
                of Lecture Notes in Computer Science.
        
                Pages 237&#x2212;261.
            Springer.
        2013.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication6578-abstract.html">
			Details <span class="sr-only" > about <em> Semantic Web Search and Inductive Reasoning  </em></span> </a> |
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			BibTeX  <span class="sr-only" > data for <em> Semantic Web Search and Inductive Reasoning  </em></span>   </a>
			
			
					| <a href="http://dx.doi.org/10.1007/978-3-642-35975-0_13"> Link <span class="sr-only" > to <em> Semantic Web Search and Inductive Reasoning  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Well&#x2212;Founded Semantics for Extended Datalog and Ontological Reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Andr&#xe9; Hernich&#x201a; Clemens Kupke&#x201a; Thomas Lukasiewicz and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Thomas Eiter&#x201a; Birte Glimm&#x201a; Yevgeny Kazakov and Markus Kr&#xf6;tzsch, editors,
             
            <em>
            Proceedings of the 26th International Workshop on Description Logics&#x201a; DL 2013&#x201a; Ulm&#x201a; Germany&#x201a; July 23&#x2212;26&#x201a; 2013</em>.
        
            Vol. 1014
                of CEUR Workshop Proceedings.
        
                Pages 209&#x2212;220.
            CEUR&#x2212;WS.org.
        2013.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication6991-abstract.html">
			Details <span class="sr-only" > about <em> Well&#x2212;Founded Semantics for Extended Datalog and Ontological Reasoning  </em></span> </a> |
			<a href="/publications/publication6991.bib">
			BibTeX  <span class="sr-only" > data for <em> Well&#x2212;Founded Semantics for Extended Datalog and Ontological Reasoning  </em></span>   </a>
			
			
					| <a href="http://ceur-ws.org/Vol-1014/paper_78.pdf"> Download (pdf)  <span class="sr-only" > of <em> Well&#x2212;Founded Semantics for Extended Datalog and Ontological Reasoning  </em></span>   </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Well&#x2212;Founded Semantics for Extended Datalog and Ontological Reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Andr&#xe9; Hernich&#x201a; Clemens Kupke&#x201a; Thomas Lukasiewicz and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Richard Hull and Wenfei Fan, editors,
             
            <em>
            Proceedings of the 32nd ACM Symposium on Principles of Database Systems&#x201a; PODS 2013&#x201a; New York&#x201a; New York&#x201a; USA&#x201a; June 22&#x2212;27&#x201a; 2013</em>.
        
                Pages 225&#x2212;236.
            ACM Press.
        2013.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication6762-abstract.html">
			Details <span class="sr-only" > about <em> Well&#x2212;Founded Semantics for Extended Datalog and Ontological Reasoning  </em></span> </a> |
			<a href="/publications/publication6762.bib">
			BibTeX  <span class="sr-only" > data for <em> Well&#x2212;Founded Semantics for Extended Datalog and Ontological Reasoning  </em></span>   </a>
			
			
					| <a href="http://doi.acm.org/10.1145/2463664.2465229"> Link <span class="sr-only" > to <em> Well&#x2212;Founded Semantics for Extended Datalog and Ontological Reasoning  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Ontology&#x2212;Based Semantic Search on the Web and its Combination with the Power of Inductive Reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Claudia d'Amato&#x201a; Nicola Fanizzi&#x201a; Bettina Fazzinga&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Annals of Mathematics and Artificial Intelligence</em>.
        
            Vol. 65.
        
            No. 2/3.
        
                Pages 83&#x2212;121.
            July,
            2012.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication5349-abstract.html">
			Details <span class="sr-only" > about <em> Ontology&#x2212;Based Semantic Search on the Web and its Combination with the Power of Inductive Reasoning  </em></span> </a> |
			<a href="/publications/publication5349.bib">
			BibTeX  <span class="sr-only" > data for <em> Ontology&#x2212;Based Semantic Search on the Web and its Combination with the Power of Inductive Reasoning  </em></span>   </a>
			
			
					| <a href="http://dx.doi.org/10.1007/s10472-012-9309-7"> Link <span class="sr-only" > to <em> Ontology&#x2212;Based Semantic Search on the Web and its Combination with the Power of Inductive Reasoning  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            A General Datalog&#x2212;Based Framework for Tractable Query Answering over Ontologies </strong> </p>
	    <p class="publicationAuthors"> <em> Andrea Cal&#xec;&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Journal of Web Semantics</em>.
        
            Vol. 14.
        
                Pages 57&#x2013;83.
            July,
            2012.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication4782-abstract.html">
			Details <span class="sr-only" > about <em> A General Datalog&#x2212;Based Framework for Tractable Query Answering over Ontologies  </em></span> </a> |
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			BibTeX  <span class="sr-only" > data for <em> A General Datalog&#x2212;Based Framework for Tractable Query Answering over Ontologies  </em></span>   </a>
			
			
					| <a href="http://dx.doi.org/10.1016/j.websem.2012.03.001"> Link <span class="sr-only" > to <em> A General Datalog&#x2212;Based Framework for Tractable Query Answering over Ontologies  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            A General Datalog&#x2212;Based Framework for Tractable Query Answering over Ontologies </strong> </p>
	    <p class="publicationAuthors"> <em> Andrea Cal&#xec;&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            No. RR&#x2212;10&#x2212;21.
        OUCL.
        March,
            2012.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication3960-abstract.html">
			Details <span class="sr-only" > about <em> A General Datalog&#x2212;Based Framework for Tractable Query Answering over Ontologies  </em></span> </a> |
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	<p class="publicationTitle"> <strong>
            Equality&#x2212;Friendly Well&#x2212;Founded Semantics and Applications to Description Logics </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Andr&#xe9; Hernich&#x201a; Clemens Kupke and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Yevgeny Kazakov&#x201a; Domenico Lembo and Frank Wolter, editors,
             
            <em>
            Proceedings of the 25th International Workshop on Description Logics&#x201a; DL 2012&#x201a; Rome&#x201a; Italy&#x201a; June 7&#x2212;10&#x201a; 2012</em>.
        
            Vol. 846
                of CEUR Workshop Proceedings.
        CEUR&#x2212;WS.org.
        2012.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication6324-abstract.html">
			Details <span class="sr-only" > about <em> Equality&#x2212;Friendly Well&#x2212;Founded Semantics and Applications to Description Logics  </em></span> </a> |
			<a href="/publications/publication6324.bib">
			BibTeX  <span class="sr-only" > data for <em> Equality&#x2212;Friendly Well&#x2212;Founded Semantics and Applications to Description Logics  </em></span>   </a>
			
			
					| <a href="http://ceur-ws.org/Vol-846/paper_5.pdf"> Download (pdf)  <span class="sr-only" > of <em> Equality&#x2212;Friendly Well&#x2212;Founded Semantics and Applications to Description Logics  </em></span>   </a>
  				
		
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			</div>

		
        
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		>
			
	
	<p class="publicationTitle"> <strong>
            Equality&#x2212;Friendly Well&#x2212;Founded Semantics and Applications to Description Logics </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Andr&#xe9; Hernich&#x201a; Clemens Kupke and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In J. Hoffmann and B. Selman, editors,
             
            <em>
            Proceedings of the 26th National Conference on Artificial Intelligence&#x201a; AAAI 2012&#x201a; Toronto&#x201a; Ontario&#x201a; Canada&#x201a; July 2012</em>.
        AAAI Press.
        2012.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Semantic Web Search Based on Ontological Conjunctive Queries </strong> </p>
	    <p class="publicationAuthors"> <em> Bettina Fazzinga&#x201a; Giorgio Gianforme&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Journal of Web Semantics</em>.
        
            Vol. 9.
        
                Pages 453&#x2212;473.
            December,
            2011.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Semantic Web Search Based on Ontological Conjunctive Queries </strong> </p>
	    <p class="publicationAuthors"> <em> Bettina Fazzinga&#x201a; Giorgio Gianforme&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            No. RR&#x2212;11&#x2212;08.
        DCS.
        October,
            2011.
        </p>
	
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	<p class="publicationTitle"> <strong>
            A Logical Toolbox for Ontological Reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Andrea Cal&#xec;&#x201a; Georg Gottlob&#x201a; Thomas Lukasiewicz and Andreas Pieris  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>SIGMOD Record</em>.
        
            Vol. 40.
        
            No. 3.
        
                Pages 5&#x2013;14.
            2011.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication5613-abstract.html">
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					| <a href="http://dx.doi.org/10.1145/2070736.2070738"> Link <span class="sr-only" > to <em> A Logical Toolbox for Ontological Reasoning  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Datalog+&#x2044;&#x2212;: A Family of Languages for Ontology Querying </strong> </p>
	    <p class="publicationAuthors"> <em> Andrea Cal&#xec;&#x201a; Georg Gottlob&#x201a; Thomas Lukasiewicz and Andreas Pieris  </em> </p>
	
	<p class="publicationDetails"> 
            In Oege de Moor&#x201a; Georg Gottlob&#x201a; Tim Furche and Andrew Jon Sellers, editors,
             
            <em>
            Datalog Reloaded &#x2212; 1st International Workshop&#x201a; Datalog 2010&#x201a; Oxford&#x201a; UK&#x201a; March 16&#x2212;19&#x201a; 2010. Revised Selected Papers</em>.
        
            Vol. 6702
                of Lecture Notes in Computer Science.
        
                Pages 351&#x2212;368.
            Springer.
        2011.
        </p>
	
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            		href="/publications/publication6640-abstract.html">
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					| <a href="http://dx.doi.org/10.1007/978-3-642-24206-9_20"> Link <span class="sr-only" > to <em> Datalog+&#x2044;&#x2212;: A Family of Languages for Ontology Querying  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Conjunctive Query Answering in Probabilistic Datalog+&#x2044;&#x2212; Ontologies </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Thomas Lukasiewicz and Gerardo I. Simari  </em> </p>
	
	<p class="publicationDetails"> 
            In Sebastian Rudolph and Claudio Gutierrez, editors,
             
            <em>
            Proceedings of the 5th International Conference on Web Reasoning and Rule Systems&#x201a; RR 2011&#x201a; Galway&#x201a; Ireland&#x201a; August 29&#x2212;30&#x201a; 2011</em>.
        
            Vol. 6902
                of Lecture Notes in Computer Science.
        
                Pages 77&#x2212;92.
            Springer.
        2011.
        </p>
	
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            		href="/publications/publication6581-abstract.html">
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					| <a href="http://dx.doi.org/10.1007/978-3-642-23580-1_7"> Link <span class="sr-only" > to <em> Conjunctive Query Answering in Probabilistic Datalog+&#x2044;&#x2212; Ontologies  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            On Minimal Constraint Networks </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 17th International Conference on Principles and Practice of Constraint Programming&#x201a; CP 2011</em>.
        Perugia&#x201a; Italy.
        2011.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication5751-abstract.html">
			Details <span class="sr-only" > about <em> On Minimal Constraint Networks  </em></span> </a> |
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	<p class="publicationTitle"> <strong>
            Introducing LoCo&#x201a; a Logic for Configuration Problems </strong> </p>
	    <p class="publicationAuthors"> <em> Markus Aschinger&#x201a; Conrad Drescher and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
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            Proceedings of the 2nd Workshop on Logics for Component Configuration&#x201a; LoCoCo 2011</em>.
        Perugia&#x201a; Italy.
        2011.
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	<p class="publicationTitle"> <strong>
            Tackling the Partner Units Configuration Problem </strong> </p>
	    <p class="publicationAuthors"> <em> Markus Aschinger&#x201a; Conrad Drescher&#x201a; Georg Gottlob&#x201a; Peter Jeavons and Evgen&#x0133; Thorstensen  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 22nd International Joint Conference on Artificial Intelligence (IJCAI 2011)</em>.
        Barcelona&#x201a; Spain.
        2011.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Optimization Methods for the Partner Units Problem </strong> </p>
	    <p class="publicationAuthors"> <em> Markus Aschinger&#x201a; Conrad Drescher&#x201a; Gerhard Friedrich&#x201a; Georg Gottlob&#x201a; Peter Jeavons&#x201a; Anna Ryabokon and Evgen&#x0133; Thorstensen  </em> </p>
	
	<p class="publicationDetails"> 
            In  
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            Proceedings of the 8th International Conference on Integration of Artificial Intelligence and Operations Research Techniques in Constraint Programming for Combinatorial Optimization Problems (CPAIOR 2011)</em>.
        Berlin&#x201a; Germany.
        2011.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Structural Decomposition Methods&#x201a; and What They are Good For </strong> </p>
	    <p class="publicationAuthors"> <em> Markus Aschinger&#x201a; Conrad Drescher&#x201a; Georg Gottlob&#x201a; Peter Jeavons and Evgen&#x0133; Thorstensen  </em> </p>
	
	<p class="publicationDetails"> 2011.
        </p> <p
            class="publicationNote"> Invited Paper at STACS 2011</p>
	
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	<p class="publicationTitle"> <strong>
            Combining Semantic Web Search with the Power of Inductive Reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Claudia d'Amato&#x201a; Nicola Fanizzi&#x201a; Bettina Fazzinga&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Amol Deshpande and Anthony Hunter, editors,
             
            <em>
            Proceedings of the 4th International Conference on Scalable Uncertainty Management&#x201a; SUM 2010&#x201a; Toulouse&#x201a; France&#x201a; September 27&#x2212;29&#x201a; 2010</em>.
        
            Vol. 6379
                of Lecture Notes in Computer Science.
        
                Pages 137&#x2212;150.
            Springer.
        2010.
        </p>
	
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            		href="/publications/publication6646-abstract.html">
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	<p class="publicationTitle"> <strong>
            Inductive Reasoning and Semantic Web Search </strong> </p>
	    <p class="publicationAuthors"> <em> Claudia d'Amato&#x201a; Floriana Esposito&#x201a; Nicola Fanizzi&#x201a; Bettina Fazzinga&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Sung Y. Shin&#x201a; Sascha Ossowski&#x201a; Michael Schumacher&#x201a; Mathew J. Palakal and Chih&#x2212;Cheng Hung, editors,
             
            <em>
            Proceedings of the 25th ACM Symposium on Applied Computing&#x201a; SAC 2010&#x201a; Sierre&#x201a; Switzerland&#x201a; March 22&#x2212;26&#x201a; 2010</em>.
        
                Pages 1446&#x2212;1447.
            ACM Press.
        2010.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication6644-abstract.html">
			Details <span class="sr-only" > about <em> Inductive Reasoning and Semantic Web Search  </em></span> </a> |
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	<p class="publicationTitle"> <strong>
            Ontological Reasoning with F&#x2212;Logic Lite and its Extensions </strong> </p>
	    <p class="publicationAuthors"> <em> Andrea Cal&#xec;&#x201a; Georg Gottlob&#x201a; Michael Kifer&#x201a; Thomas Lukasiewicz and Andreas Pieris  </em> </p>
	
	<p class="publicationDetails"> 
            In Maria Fox and David Poole, editors,
             
            <em>
            Proceedings of the 24th AAAI Conference on Artificial Intelligence&#x201a; AAAI 2010&#x201a; Atlanta&#x201a; Georgia&#x201a; USA&#x201a; July 11&#x2212;15&#x201a; 2010</em>.
        AAAI Press.
        2010.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication6638-abstract.html">
			Details <span class="sr-only" > about <em> Ontological Reasoning with F&#x2212;Logic Lite and its Extensions  </em></span> </a> |
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	<p class="publicationTitle"> <strong>
            Semantic Web Search Based on Ontological Conjunctive Queries </strong> </p>
	    <p class="publicationAuthors"> <em> Bettina Fazzinga&#x201a; Giorgio Gianforme&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Sebastian Link and Henri Prade, editors,
             
            <em>
            Proceedings of the 6th International Symposium on the Foundations of Information and Knowledge Systems&#x201a; FoIKS 2010&#x201a; Sofia&#x201a; Bulgaria&#x201a; February 15&#x2212;19&#x201a; 2010</em>.
        
            Vol. 5956
                of Lecture Notes in Computer Science.
        
                Pages 153&#x2212;172.
            Springer.
        2010.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication6642-abstract.html">
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	<p class="publicationTitle"> <strong>
            Datalog+&#x2044;&#x2212;: A Family of Logical Knowledge Representation and Query Languages for New Applications </strong> </p>
	    <p class="publicationAuthors"> <em> Andrea Cal&#xec;&#x201a; Georg Gottlob&#x201a; Thomas Lukasiewicz&#x201a; Bruno Marnette and Andreas Pieris  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 25th IEEE Symposium on Logic in Computer Science&#x201a; LICS 2010&#x201a; Edinburgh&#x201a; UK&#x201a; July 2010</em>.
        
                Pages 228&#x2013;242.
            IEEE Computer Society.
        2010.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication4747-abstract.html">
			Details <span class="sr-only" > about <em> Datalog+&#x2044;&#x2212;: A Family of Logical Knowledge Representation and Query Languages for New Applications  </em></span> </a> |
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		>
			
	
	<p class="publicationTitle"> <strong>
            Tackling the Partner Units Configuration Problem </strong> </p>
	    <p class="publicationAuthors"> <em> Markus Aschinger&#x201a; Conrad Drescher&#x201a; Gerhard Friedrich&#x201a; Georg Gottlob&#x201a; Peter Jeavons&#x201a; Anna Ryabokon and Evgen&#x0133; Thorstensen  </em> </p>
	
	<p class="publicationDetails"> 
            No. CS&#x2212;RR&#x2212;10&#x2212;28.
        Computing Laboratory&#x201a; University of Oxford.
        2010.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Semantic Web Information Management &#x2212; A Model&#x2212;Based Perspective </strong> </p>
	    <p class="publicationAuthors"> <em> Andrea Cal&#xec;&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Roberto De Virgilio&#x201a; Fausto Giunchiglia and Letizia Tanca, editors,
             
            <em>
            Semantic Web Information Management</em>.
        
                Pages 249&#x2212;279.
            Springer.
        2009.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            A General Datalog&#x2212;Based Framework for Tractable Query Answering over Ontologies </strong> </p>
	    <p class="publicationAuthors"> <em> Andrea Cal&#xec;&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Jan Paredaens and Jianwen Su, editors,
             
            <em>
            Proceedings of the 28th ACM Symposium on Principles of Database Systems&#x201a; PODS 2009&#x201a; Providence&#x201a; Rhode Island&#x201a; USA&#x201a; June 19 &#x2212; July 1&#x201a; 2009</em>.
        
                Pages 77&#x2212;86.
            ACM Press.
        2009.
        </p>
	
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					| <a href="http://dl.acm.org/citation.cfm?doid=1559795.1559809"> Link <span class="sr-only" > to <em> A General Datalog&#x2212;Based Framework for Tractable Query Answering over Ontologies  </em></span> </a>
  				
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            A General Datalog&#x2212;Based Framework for Tractable Query Answering over Ontologies (Extended Abstract) </strong> </p>
	    <p class="publicationAuthors"> <em> Andrea Cal&#xec;&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Valeria De Antonellis&#x201a; Silvana Castano&#x201a; Barbara Catania and Giovanna Guerrini, editors,
             
            <em>
            Proceedings of the 17th Italian Symposium on Advanced Database Systems&#x201a; SEBD 2009&#x201a; Camogli&#x201a; Italy&#x201a; June 21&#x2212;24&#x201a; 2009</em>.
        
                Pages 29&#x2212;36.
            Edizioni Seneca.
        2009.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Combining Semantic Web Search with the Power of Inductive Reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Claudia d'Amato&#x201a; Nicola Fanizzi&#x201a; Bettina Fazzinga&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Fernando Bobillo&#x201a; Paulo Cesar G. da Costa&#x201a; Claudia d'Amato&#x201a; Nicola Fanizzi&#x201a; Kathryn B. Laskey&#x201a; Kenneth J. Laskey&#x201a; Thomas Lukasiewicz&#x201a; Trevor Martin&#x201a; Matthias Nickles&#x201a; Michael Pool and Pavel Smrz, editors,
             
            <em>
            Proceedings of the 5th International Workshop on Uncertainty Reasoning for the Semantic Web&#x201a; URSW 2009&#x201a; Washington DC&#x201a; USA&#x201a; October 26&#x201a; 2009</em>.
        
            Vol. 527
                of CEUR Workshop Proceedings.
        
                Pages 15&#x2212;26.
            CEUR&#x2212;WS.org.
        2009.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Datalog<sup>&#177;</sup>: A Unified Approach to Ontologies and Integrity Constraints </strong> </p>
	    <p class="publicationAuthors"> <em> Andrea Cal&#xec;&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Ronald Fagin, editor,
             
            <em>
            Proceedings of the 12th International Conference on Database Theory&#x201a; ICDT 2009&#x201a; St. Petersburg&#x201a; Russia&#x201a; March 23&#x2212;25&#x201a; 2009</em>.
        
            Vol. 361
                of ACM International Conference Proceeding Series.
        
                Pages 14&#x2212;30.
            ACM Press.
        2009.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Tractable Query Answering over Ontologies with Datalog+&#x2044;&#x2212; </strong> </p>
	    <p class="publicationAuthors"> <em> Andrea Cal&#xec;&#x201a; Georg Gottlob and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Bernardo Cuenca Grau&#x201a; Ian Horrocks&#x201a; Boris Motik and Ulrike Sattler, editors,
             
            <em>
            Proceedings of the 22nd International Workshop on Description Logics&#x201a; DL 2009&#x201a; Oxford&#x201a; UK&#x201a; July 27&#x2212;30&#x201a; 2009</em>.
        
            Vol. 477
                of CEUR Workshop Proceedings.
        CEUR&#x2212;WS.org.
        2009.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            A Backtracking&#x2212;Based Algorithm for Computing Hypertree&#x2212;Decompositions </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Marko Samer  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>CoRR</em>.
        
            Vol. abs/cs/0701083.
        2007.
        </p>
	
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		DOI (http://arxiv.org/abs/cs/0701083)
		</a> 
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            Hypertree width and related hypergraph invariants </strong> </p>
	    <p class="publicationAuthors"> <em> Isolde Adler&#x201a; Georg Gottlob and Martin Grohe  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Eur. J. Comb.</em>.
        
            Vol. 28.
        
            No. 8.
        
                Pages 2167&#x2212;2181.
            2007.
        </p>
	
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			 | <a
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		DOI (10.1016/j.ejc.2007.04.013)
		</a> 
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            A logical approach to multicut problems </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Stephanie Tien Lee  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Inf. Process. Lett.</em>.
        
            Vol. 103.
        
            No. 4.
        
                Pages 136&#x2212;141.
            2007.
        </p>
	
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			 | <a
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		DOI (10.1016/j.ipl.2007.03.005)
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		>
			
	
	<p class="publicationTitle"> <strong>
            Efficient Datalog Abduction through Bounded Treewidth </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Reinhard Pichler and Fang Wei  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the Twenty&#x2212;Second AAAI Conference on Artificial Intelligence&#x201a; July 22&#x2212;26&#x201a; 2007&#x201a; Vancouver&#x201a; British Columbia&#x201a; Canada</em>.
        
                Pages 1626&#x2212;1631.
            AAAI Press.
        2007.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication108-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            On the complexity of combinatorial auctions: structured item graphs and hypertree decomposition </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Gianluigi Greco  </em> </p>
	
	<p class="publicationDetails"> 
            In Jeffrey K. MacKie&#x2212;Mason&#x201a; David C. Parkes and Paul Resnick, editors,
             
            <em>
            Proceedings 8th ACM Conference on Electronic Commerce (EC&#x2212;2007)&#x201a; San Diego&#x201a; California&#x201a; USA&#x201a; June 11&#x2212;15&#x201a; 2007</em>.
        
                Pages 152&#x2212;161.
            ACM.
        2007.
        </p>
	
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		DOI (10.1145/1250910.1250934)
		</a> 
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            The Lixto Systems Applications in Business Intelligence and Semantic Web </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner&#x201a; Oliver Fr&#xf6;lich and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Enrico Franconi&#x201a; Michael Kifer and Wolfgang May, editors,
             
            <em>
            The Semantic Web: Research and Applications&#x201a; 4th European Semantic Web Conference&#x201a; ESWC 2007&#x201a; Innsbruck&#x201a; Austria&#x201a; June 3&#x2212;7&#x201a; 2007&#x201a; Proceedings</em>.
        
            Vol. 4519
                of Lecture Notes in Computer Science.
        
                Pages 16&#x2212;26.
            Springer.
        2007.
        </p>
	
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			 | <a
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		DOI (10.1007/978-3-540-72667-8_3)
		</a> 
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            Complexity of Pure Equilibria in Bayesian Games </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Gianluigi Greco and Toni Mancini  </em> </p>
	
	<p class="publicationDetails"> 
            In Manuela M. Veloso, editor,
             
            <em>
            IJCAI 2007&#x201a; Proceedings of the 20th International Joint Conference on Artificial Intelligence&#x201a; Hyderabad&#x201a; India&#x201a; January 6&#x2212;12&#x201a; 2007</em>.
        
                Pages 1294&#x2212;1299.
            2007.
        </p>
	
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            		href="/publications/publication111-abstract.html">
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	<p class="publicationTitle"> <strong>
            Conditional Constraint Satisfaction: Logical Foundations and Complexity </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Gianluigi Greco and Toni Mancini  </em> </p>
	
	<p class="publicationDetails"> 
            In Manuela M. Veloso, editor,
             
            <em>
            IJCAI 2007&#x201a; Proceedings of the 20th International Joint Conference on Artificial Intelligence&#x201a; Hyderabad&#x201a; India&#x201a; January 6&#x2212;12&#x201a; 2007</em>.
        
                Pages 88&#x2212;93.
            2007.
        </p>
	
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            		href="/publications/publication112-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Generalized hypertree decompositions: np&#x2212;hardness and tractable variants </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Zolt&#xe1;n Mikl&#xf3;s and Thomas Schwentick  </em> </p>
	
	<p class="publicationDetails"> 
            In Leonid Libkin, editor,
             
            <em>
            Proceedings of the Twenty&#x2212;Sixth ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; June 11&#x2212;13&#x201a; 2007&#x201a; Beijing&#x201a; China</em>.
        
                Pages 13&#x2212;22.
            ACM.
        2007.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Monadic datalog over finite structures with bounded treewidth </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Reinhard Pichler and Fang Wei  </em> </p>
	
	<p class="publicationDetails"> 
            In Leonid Libkin, editor,
             
            <em>
            Proceedings of the Twenty&#x2212;Sixth ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; June 11&#x2212;13&#x201a; 2007&#x201a; Beijing&#x201a; China</em>.
        
                Pages 165&#x2212;174.
            ACM.
        2007.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Foundations of Rule&#x2212;Based Query Answering </strong> </p>
	    <p class="publicationAuthors"> <em> Fran&#xe7;ois Bry&#x201a; Norbert Eisinger&#x201a; Thomas Eiter&#x201a; Tim Furche&#x201a; Georg Gottlob&#x201a; Clemens Ley&#x201a; Benedikt Linse&#x201a; Reinhard Pichler and Fang Wei  </em> </p>
	
	<p class="publicationDetails"> 
            In Grigoris Antoniou&#x201a; Uwe A&#xdf;mann&#x201a; Cristina Baroglio&#x201a; Stefan Decker&#x201a; Nicola Henze&#x201a; Paula&#x2212;Lavinia Patranjan and Robert Tolksdorf, editors,
             
            <em>
            Reasoning Web</em>.
        
            Vol. 4636
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                Pages 1&#x2212;153.
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        2007.
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	<p class="publicationTitle"> <strong>
            The DLV system for knowledge representation and reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Nicola Leone&#x201a; Gerald Pfeifer&#x201a; Wolfgang Faber&#x201a; Thomas Eiter&#x201a; Georg Gottlob&#x201a; Simona Perri and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>ACM Trans. Comput. Log.</em>.
        
            Vol. 7.
        
            No. 3.
        
                Pages 499&#x2212;562.
            2006.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Conjunctive Queries over Trees </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Christoph Koch and Klaus U. Schulz  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>CoRR</em>.
        
            Vol. abs/cs/0602004.
        2006.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Conjunctive queries over trees </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Christoph Koch and Klaus U. Schulz  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. ACM</em>.
        
            Vol. 53.
        
            No. 2.
        
                Pages 238&#x2212;272.
            2006.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Reasoning under minimal upper bounds in propositional logic </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Theor. Comput. Sci.</em>.
        
            Vol. 369.
        
            No. 1&#x2212;3.
        
                Pages 82&#x2212;115.
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	<p class="publicationTitle"> <strong>
            Bounded Treewidth as a Key to Tractability of Knowledge Representation and Reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Reinhard Pichler and Fang Wei  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings&#x201a; The Twenty&#x2212;First National Conference on Artificial Intelligence and the Eighteenth Innovative Applications of Artificial Intelligence Conference&#x201a; July 16&#x2212;20&#x201a; 2006&#x201a; Boston&#x201a; Massachusetts&#x201a; USA</em>.
        AAAI Press.
        2006.
        </p>
	
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	<p class="publicationTitle"> <strong>
            The Lixto Project: Exploring New Frontiers of Web Data Extraction </strong> </p>
	    <p class="publicationAuthors"> <em> Julien Carme&#x201a; Michal Ceresna&#x201a; Oliver Fr&#xf6;lich&#x201a; Georg Gottlob&#x201a; Tamir Hassan&#x201a; Marcus Herzog&#x201a; Wolfgang Holzinger and Bernhard Kr&#xfc;pl  </em> </p>
	
	<p class="publicationDetails"> 
            In  
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            BNCOD</em>.
        
                Pages 1&#x2212;15.
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			 | <a
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	<p class="publicationTitle"> <strong>
            Tractable database design through bounded treewidth </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Reinhard Pichler and Fang Wei  </em> </p>
	
	<p class="publicationDetails"> 
            In Stijn Vansummeren, editor,
             
            <em>
            Proceedings of the Twenty&#x2212;Fifth ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; June 26&#x2212;28&#x201a; 2006&#x201a; Chicago&#x201a; Illinois&#x201a; Maryland&#x201a; USA</em>.
        
                Pages 124&#x2212;133.
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        2006.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Data exchange: computing cores in polynomial time </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Alan Nash  </em> </p>
	
	<p class="publicationDetails"> 
            In Stijn Vansummeren, editor,
             
            <em>
            Proceedings of the Twenty&#x2212;Fifth ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; June 26&#x2212;28&#x201a; 2006&#x201a; Chicago&#x201a; Illinois&#x201a; Maryland&#x201a; USA</em>.
        
                Pages 40&#x2212;49.
            ACM.
        2006.
        </p>
	
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	<p class="publicationTitle"> <strong>
            RDF Querying: Language Constructs and Evaluation Methods Compared </strong> </p>
	    <p class="publicationAuthors"> <em> Tim Furche&#x201a; Benedikt Linse&#x201a; Fran&#xe7;ois Bry&#x201a; Dimitris Plexousakis and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Pedro Barahona&#x201a; Fran&#xe7;ois Bry&#x201a; Enrico Franconi&#x201a; Nicola Henze and Ulrike Sattler, editors,
             
            <em>
            Reasoning Web&#x201a; Second International Summer School 2006&#x201a; Lisbon&#x201a; Portugal&#x201a; September 4&#x2212;8&#x201a; 2006&#x201a; Tutorial Lectures</em>.
        
            Vol. 4126
                of Lecture Notes in Computer Science.
        
                Pages 1&#x2212;52.
            Springer.
        2006.
        </p>
	
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	<p class="publicationTitle"> <strong>
            A Formal Comparison of Visual Web Wrapper Generators </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Christoph Koch  </em> </p>
	
	<p class="publicationDetails"> 
            In Jir&#xed; Wiedermann&#x201a; Gerard Tel&#x201a; Jaroslav Pokorn&#xfd;&#x201a; M&#xe1;ria Bielikov&#xe1; and Julius Stuller, editors,
             
            <em>
            SOFSEM 2006: Theory and Practice of Computer Science&#x201a; 32nd Conference on Current Trends in Theory and Practice of Computer Science&#x201a; Mer&#xed;n&#x201a; Czech Republic&#x201a; January 21&#x2212;27&#x201a; 2006&#x201a; Proceedings</em>.
        
            Vol. 3831
                of Lecture Notes in Computer Science.
        
                Pages 30&#x2212;48.
            Springer.
        2006.
        </p>
	
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		DOI (10.1007/11611257_3)
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	<p class="publicationTitle"> <strong>
            Complexity of propositional nested circumscription and nested abnormality theories </strong> </p>
	    <p class="publicationAuthors"> <em> Marco Cadoli&#x201a; Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>ACM Trans. Comput. Log.</em>.
        
            Vol. 6.
        
            No. 2.
        
                Pages 232&#x2212;272.
            2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Efficient algorithms for processing XPath queries </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Christoph Koch and Reinhard Pichler  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>ACM Trans. Database Syst.</em>.
        
            Vol. 30.
        
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                Pages 444&#x2212;491.
            2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            The complexity of XPath query evaluation and XML typing </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Christoph Koch&#x201a; Reinhard Pichler and Luc Segoufin  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. ACM</em>.
        
            Vol. 52.
        
            No. 2.
        
                Pages 284&#x2212;335.
            2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Pure Nash Equilibria: Hard and Easy Games </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Gianluigi Greco and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Artif. Intell. Res. (JAIR)</em>.
        
            Vol. 24.
        
                Pages 357&#x2212;406.
            2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Web Data Extraction for Business Intelligence: The Lixto Approach </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Gottfried Vossen&#x201a; Frank Leymann&#x201a; Peter C. Lockemann and Wolffried Stucky, editors,
             
            <em>
            Datenbanksysteme in Business&#x201a; Technologie und Web&#x201a; 11. Fachtagung des GI&#x2212;Fachbereichs "Datenbanken und Informationssysteme" (DBIS)&#x201a; Karlsruhe&#x201a; 2.&#x2212;4. M&#xe4;rz 2005</em>.
        
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                of LNI.
        
                Pages 30&#x2212;47.
            GI.
        2005.
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            		href="/publications/publication129-abstract.html">
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	<p class="publicationTitle"> <strong>
            Asymptotic Conditional Probability in Modal Logic: A Probabilistic Reconstruction of Nonmonotonic Logic </strong> </p>
	    <p class="publicationAuthors"> <em> Riccardo Rosati and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Leslie Pack Kaelbling and Alessandro Saffiotti, editors,
             
            <em>
            IJCAI&#x2212;05&#x201a; Proceedings of the Nineteenth International Joint Conference on Artificial Intelligence&#x201a; Edinburgh&#x201a; Scotland&#x201a; UK&#x201a; July 30&#x2212;August 5&#x201a; 2005</em>.
        
                Pages 1378&#x2212;1383.
            Professional Book Center.
        2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            The Complexity of Quantified Constraint Satisfaction Problems under Structural Restrictions </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Gianluigi Greco and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In Leslie Pack Kaelbling and Alessandro Saffiotti, editors,
             
            <em>
            IJCAI&#x2212;05&#x201a; Proceedings of the Nineteenth International Joint Conference on Artificial Intelligence&#x201a; Edinburgh&#x201a; Scotland&#x201a; UK&#x201a; July 30&#x2212;August 5&#x201a; 2005</em>.
        
                Pages 150&#x2212;155.
            Professional Book Center.
        2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            The Personal Publication Reader </strong> </p>
	    <p class="publicationAuthors"> <em> Fabian Abel&#x201a; Robert Baumgartner&#x201a; Adrian Brooks&#x201a; Christian Enzi&#x201a; Georg Gottlob&#x201a; Nicola Henze&#x201a; Marcus Herzog&#x201a; Matthias Kriesell&#x201a; Wolfgang Nejdl and Kai Tomaschewski  </em> </p>
	
	<p class="publicationDetails"> 
            In Yolanda Gil&#x201a; Enrico Motta&#x201a; V. Richard Benjamins and Mark A. Musen, editors,
             
            <em>
            The Semantic Web &#x2212; ISWC 2005&#x201a; 4th International Semantic Web Conference&#x201a; ISWC 2005&#x201a; Galway&#x201a; Ireland&#x201a; November 6&#x2212;10&#x201a; 2005&#x201a; Proceedings</em>.
        
            Vol. 3729
                of Lecture Notes in Computer Science.
        
                Pages 1050&#x2212;1053.
            Springer.
        2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Data Integration: a Challenging ASP Application </strong> </p>
	    <p class="publicationAuthors"> <em> Nicola Leone&#x201a; Thomas Eiter&#x201a; Wolfgang Faber&#x201a; Michael Fink&#x201a; Georg Gottlob&#x201a; Luigi Granata&#x201a; Gianluigi Greco&#x201a; Edyta Kalka&#x201a; Giovambattista Ianni&#x201a; Domenico Lembo&#x201a; Maurizio Lenzerini&#x201a; Vincenzino Lio&#x201a; Bartosz Nowicki&#x201a; Riccardo Rosati&#x201a; Marco Ruzzi&#x201a; Witold Staniszkis and Giorgio Terracina  </em> </p>
	
	<p class="publicationDetails"> 
            In Chitta Baral&#x201a; Gianluigi Greco&#x201a; Nicola Leone and Giorgio Terracina, editors,
             
            <em>
            Logic Programming and Nonmonotonic Reasoning&#x201a; 8th International Conference&#x201a; LPNMR 2005&#x201a; Diamante&#x201a; Italy&#x201a; September 5&#x2212;8&#x201a; 2005&#x201a; Proceedings</em>.
        
            Vol. 3662
                of Lecture Notes in Computer Science.
        
                Pages 379&#x2212;383.
            Springer.
        2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Computing cores for data exchange: new algorithms and practical solutions </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Chen Li, editor,
             
            <em>
            Proceedings of the Twenty&#x2212;fourth ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; June 13&#x2212;15&#x201a; 2005&#x201a; Baltimore&#x201a; Maryland&#x201a; USA</em>.
        
                Pages 148&#x2212;159.
            ACM.
        2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Information Extraction for the Semantic Web </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner&#x201a; Thomas Eiter&#x201a; Georg Gottlob&#x201a; Marcus Herzog and Christoph Koch  </em> </p>
	
	<p class="publicationDetails"> 
            In Norbert Eisinger and Jan Maluszynski, editors,
             
            <em>
            Reasoning Web&#x201a; First International Summer School 2005&#x201a; Msida&#x201a; Malta&#x201a; July 25&#x2212;29&#x201a; 2005&#x201a; Tutorial Lectures</em>.
        
            Vol. 3564
                of Lecture Notes in Computer Science.
        
                Pages 275&#x2212;289.
            Springer.
        2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Boosting Information Integration: The INFOMIX System </strong> </p>
	    <p class="publicationAuthors"> <em> Nicola Leone&#x201a; Thomas Eiter&#x201a; Wolfgang Faber&#x201a; Michael Fink&#x201a; Georg Gottlob and Gianluigi Greco  </em> </p>
	
	<p class="publicationDetails"> 
            In Andrea Cal&#xec;&#x201a; Diego Calvanese&#x201a; Enrico Franconi&#x201a; Maurizio Lenzerini and Letizia Tanca, editors,
             
            <em>
            Proceedings of the Thirteenth Italian Symposium on Advanced Database Systems&#x201a; SEBD 2005&#x201a; Brixen&#x2212;Bressanone (near Bozen&#x2212;Bolzano)&#x201a; Italy&#x201a; June 19&#x2212;22&#x201a; 2005</em>.
        
                Pages 55&#x2212;66.
            2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            The INFOMIX system for advanced integration of incomplete and inconsistent data </strong> </p>
	    <p class="publicationAuthors"> <em> Nicola Leone&#x201a; Gianluigi Greco&#x201a; Giovambattista Ianni&#x201a; Vincenzino Lio&#x201a; Giorgio Terracina&#x201a; Thomas Eiter&#x201a; Wolfgang Faber&#x201a; Michael Fink&#x201a; Georg Gottlob&#x201a; Riccardo Rosati&#x201a; Domenico Lembo&#x201a; Maurizio Lenzerini&#x201a; Marco Ruzzi&#x201a; Edyta Kalka&#x201a; Bartosz Nowicki and Witold Staniszkis  </em> </p>
	
	<p class="publicationDetails"> 
            In Fatma &#xd6;zcan, editor,
             
            <em>
            Proceedings of the ACM SIGMOD International Conference on Management of Data&#x201a; Baltimore&#x201a; Maryland&#x201a; USA&#x201a; June 14&#x2212;16&#x201a; 2005</em>.
        
                Pages 915&#x2212;917.
            ACM.
        2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Hypertree Decompositions: Structure&#x201a; Algorithms&#x201a; and Applications </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Martin Grohe&#x201a; Nysret Musliu&#x201a; Marko Samer and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In Dieter Kratsch, editor,
             
            <em>
            Graph&#x2212;Theoretic Concepts in Computer Science&#x201a; 31st International Workshop&#x201a; WG 2005&#x201a; Metz&#x201a; France&#x201a; June 23&#x2212;25&#x201a; 2005&#x201a; Revised Selected Papers</em>.
        
            Vol. 3787
                of Lecture Notes in Computer Science.
        
                Pages 1&#x2212;15.
            Springer.
        2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Integrating Semi&#x2212;structured Data into Business Applications: A Web Intelligence Example </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner&#x201a; Oliver Fr&#xf6;lich&#x201a; Georg Gottlob&#x201a; Marcus Herzog and Peter Lehmann  </em> </p>
	
	<p class="publicationDetails"> 
            In Klaus&#x2212;Dieter Althoff&#x201a; Andreas Dengel&#x201a; Ralph Bergmann&#x201a; Markus Nick and Thomas Roth&#x2212;Berghofer, editors,
             
            <em>
            Professional Knowledge Management&#x201a; Third Biennial Conference&#x201a; WM 2005&#x201a; Kaiserslautern&#x201a; Germany&#x201a; April 10&#x2212;13&#x201a; 2005&#x201a; Revised Selected Papers</em>.
        
            Vol. 3782
                of Lecture Notes in Computer Science.
        
                Pages 469&#x2212;482.
            Springer.
        2005.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Monadic datalog and the expressive power of languages for Web information extraction </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Christoph Koch  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. ACM</em>.
        
            Vol. 51.
        
            No. 1.
        
                Pages 74&#x2212;113.
            2004.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Existential second&#x2212;order logic over graphs: Charting the tractability frontier </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Phokion G. Kolaitis and Thomas Schwentick  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. ACM</em>.
        
            Vol. 51.
        
            No. 2.
        
                Pages 312&#x2212;362.
            2004.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Hypergraphs in Model Checking: Acyclicity and Hypertree&#x2212;Width versus Clique&#x2212;Width </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Reinhard Pichler  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>SIAM J. Comput.</em>.
        
            Vol. 33.
        
            No. 2.
        
                Pages 351&#x2212;378.
            2004.
        </p>
	
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		</a> 
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            Logic&#x2212;based Web Information Extraction </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Christoph Koch  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>SIGMOD Record</em>.
        
            Vol. 33.
        
            No. 2.
        
                Pages 87&#x2212;94.
            2004.
        </p>
	
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	<p class="publicationTitle"> <strong>
            2nd International Workshop on Complexity in Automated Deduction (CiAD) &#x2212; Foreword </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Miki Hermann and Micha&#xeb;l Rusinowitch  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Theory Comput. Syst.</em>.
        
            Vol. 37.
        
            No. 6.
        
                Pages 639&#x2212;640.
            2004.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Hypergraph Transversals </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Dietmar Seipel and Jose Maria Turull Torres, editors,
             
            <em>
            Foundations of Information and Knowledge Systems&#x201a; Third International Symposium&#x201a; FoIKS 2004&#x201a; Wilhelminenburg Castle&#x201a; Austria&#x201a; February 17&#x2212;20&#x201a; 2004&#x201a; Proceedings</em>.
        
            Vol. 2942
                of Lecture Notes in Computer Science.
        
                Pages 1&#x2212;5.
            Springer.
        2004.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Second&#x2212;Order Logic over Finite Structures &#x2212; Report on a Research Programme </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In David A. Basin and Micha&#xeb;l Rusinowitch, editors,
             
            <em>
            Automated Reasoning &#x2212; Second International Joint Conference&#x201a; IJCAR 2004&#x201a; Cork&#x201a; Ireland&#x201a; July 4&#x2212;8&#x201a; 2004&#x201a; Proceedings</em>.
        
            Vol. 3097
                of Lecture Notes in Computer Science.
        
                Pages 229&#x2212;243.
            Springer.
        2004.
        </p>
	
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				[80] 
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		>
			
	
	<p class="publicationTitle"> <strong>
            The Lixto Data Extraction Project &#x2212; Back and Forth between Theory and Practice </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Christoph Koch&#x201a; Robert Baumgartner&#x201a; Marcus Herzog and Sergio Flesca  </em> </p>
	
	<p class="publicationDetails"> 
            In Alin Deutsch, editor,
             
            <em>
            Proceedings of the Twenty&#x2212;third ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; June 14&#x2212;16&#x201a; 2004&#x201a; Paris&#x201a; France</em>.
        
                Pages 1&#x2212;12.
            ACM.
        2004.
        </p>
	
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		DOI (10.1145/1055558.1055560)
		</a> 
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				[81] 
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	<p class="publicationTitle"> <strong>
            Conjunctive Queries over Trees </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Christoph Koch and Klaus U. Schulz  </em> </p>
	
	<p class="publicationDetails"> 
            In Alin Deutsch, editor,
             
            <em>
            Proceedings of the Twenty&#x2212;third ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; June 14&#x2212;16&#x201a; 2004&#x201a; Paris&#x201a; France</em>.
        
                Pages 189&#x2212;200.
            ACM.
        2004.
        </p>
	
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				[82] 
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		>
			
	
	<p class="publicationTitle"> <strong>
            Interactively Adding Web Service Interfaces to Existing Web Applications </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner&#x201a; Georg Gottlob&#x201a; Marcus Herzog and Wolfgang Slany  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            2004 Symposium on Applications and the Internet (SAINT 2004)&#x201a; 26&#x2212;30 January 2004&#x201a; Tokyo&#x201a; Japan</em>.
        
                Pages 74&#x2212;80.
            IEEE Computer Society.
        2004.
        </p>
	
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            		href="/publications/publication149-abstract.html">
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				[83] 
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		>
			
	
	<p class="publicationTitle"> <strong>
            Advances in Databases and Information Systems&#x201a; 8th East European Conference&#x201a; ADBIS 2004&#x201a; Budapest&#x201a; Hungary&#x201a; September 22&#x2212;25&#x201a; 2004&#x201a; Proceesing </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Andr&#xe1;s A. Bencz&#xfa;r and J&#xe1;nos Demetrovics, editors  </em> </p>
	
	<p class="publicationDetails"> </p>
	
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				[84] 
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	<p class="publicationTitle"> <strong>
            A Formal Comparison of Visual Web Wrapper Generators </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Christoph Koch  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>CoRR</em>.
        
            Vol. cs.DB/0310012.
        2003.
        </p>
	
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					| <a href="http://arxiv.org/abs/cs.DB/0310012"> Link <span class="sr-only" > to <em> A Formal Comparison of Visual Web Wrapper Generators  </em></span> </a>
  				
		
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				[85] 
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		>
			
	
	<p class="publicationTitle"> <strong>
            On the complexity of single&#x2212;rule datalog queries </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Christos H. Papadimitriou  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Inf. Comput.</em>.
        
            Vol. 183.
        
            No. 1.
        
                Pages 104&#x2212;122.
            2003.
        </p>
	
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			 | <a
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		DOI (10.1016/S0890-5401(03)00012-9)
		</a> 
		
		</div> 
	</div> 
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Guest Editor's Foreword </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Comput. Syst. Sci.</em>.
        
            Vol. 66.
        
            No. 1.
        
                Pages 1.
            2003.
        </p>
	
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			 | <a
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		DOI (10.1016/S0022-0000(02)00026-0)
		</a> 
		
		</div> 
	</div> 
	
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		<div
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		>
			
	
	<p class="publicationTitle"> <strong>
            Robbers&#x201a; marshals&#x201a; and guards: game theoretic and logical characterizations of hypertree width </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Comput. Syst. Sci.</em>.
        
            Vol. 66.
        
            No. 4.
        
                Pages 775&#x2212;808.
            2003.
        </p>
	
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		</a> 
		
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				[88] 
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		>
			
	
	<p class="publicationTitle"> <strong>
            New Results on Monotone Dualization and Generating Hypergraph Transversals </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Kazuhisa Makino  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>SIAM J. Comput.</em>.
        
            Vol. 32.
        
            No. 2.
        
                Pages 514&#x2212;537.
            2003.
        </p>
	
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				[89] 
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		>
			
	
	<p class="publicationTitle"> <strong>
            XPath Processing in a Nutshell </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Christoph Koch and Reinhard Pichler  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>SIGMOD Record</em>.
        
            Vol. 32.
        
            No. 1.
        
                Pages 12&#x2212;19.
            2003.
        </p>
	
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		</a> 
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				[90] 
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		>
			
	
	<p class="publicationTitle"> <strong>
            XPath processing in a nutshell </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Christoph Koch and Reinhard Pichler  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>SIGMOD Record</em>.
        
            Vol. 32.
        
            No. 2.
        
                Pages 21&#x2212;27.
            2003.
        </p>
	
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		</a> 
		
		</div> 
	</div> 
	
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            XPath Query Processing </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Christoph Koch  </em> </p>
	
	<p class="publicationDetails"> 
            In Georg Lausen and Dan Suciu, editors,
             
            <em>
            Database Programming Languages&#x201a; 9th International Workshop&#x201a; DBPL 2003&#x201a; Potsdam&#x201a; Germany&#x201a; September 6&#x2212;8&#x201a; 2003&#x201a; Revised Papers</em>.
        
            Vol. 2921
                of Lecture Notes in Computer Science.
        
                Pages 20.
            Springer.
        2003.
        </p>
	
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		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            XPath Query Evaluation: Improving Time and Space Efficiency </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Christoph Koch and Reinhard Pichler  </em> </p>
	
	<p class="publicationDetails"> 
            In Umeshwar Dayal&#x201a; Krithi Ramamritham and T. M. Vijayaraman, editors,
             
            <em>
            Proceedings of the 19th International Conference on Data Engineering&#x201a; March 5&#x2212;8&#x201a; 2003&#x201a; Bangalore&#x201a; India</em>.
        
                Pages 379&#x2212;390.
            IEEE Computer Society.
        2003.
        </p>
	
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				[93] 
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		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Web Information Acquisition with Lixto Suite </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner&#x201a; Michal Ceresna&#x201a; Georg Gottlob&#x201a; Marcus Herzog and Viktor Zigo  </em> </p>
	
	<p class="publicationDetails"> 
            In Umeshwar Dayal&#x201a; Krithi Ramamritham and T. M. Vijayaraman, editors,
             
            <em>
            Proceedings of the 19th International Conference on Data Engineering&#x201a; March 5&#x2212;8&#x201a; 2003&#x201a; Bangalore&#x201a; India</em>.
        
                Pages 747&#x2212;749.
            IEEE Computer Society.
        2003.
        </p>
	
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            		href="/publications/publication158-abstract.html">
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Visual Programming of Web Data Aggregation Applications </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner&#x201a; Georg Gottlob and Marcus Herzog  </em> </p>
	
	<p class="publicationDetails"> 
            In Subbarao Kambhampati and Craig A. Knoblock, editors,
             
            <em>
            Proceedings of IJCAI&#x2212;03 Workshop on Information Integration on the Web (IIWeb&#x2212;03)&#x201a; August 9&#x2212;10&#x201a; 2003&#x201a; Acapulco&#x201a; Mexico</em>.
        
                Pages 137&#x2212;142.
            2003.
        </p>
	
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            		href="/publications/publication159-abstract.html">
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			 | <a
		href="http://dx.doi.org/http://www.isi.edu/info-agents/workshops/ijcai03/papers/Herzog-ijcai03-herzog.pdf">
		DOI (http://www.isi.edu/info-agents/workshops/ijcai03/papers/Herzog-ijcai03-herzog.pdf)
		</a> 
		
		</div> 
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		>
			
	
	<p class="publicationTitle"> <strong>
            The complexity of XPath query evaluation </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Christoph Koch and Reinhard Pichler  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the Twenty&#x2212;Second ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; June 9&#x2212;12&#x201a; 2003&#x201a; San Diego&#x201a; CA&#x201a; USA</em>.
        
                Pages 179&#x2212;190.
            ACM.
        2003.
        </p>
	
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			 | <a
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		DOI (10.1145/773153.773171)
		</a> 
		
		</div> 
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Pure Nash equilibria: hard and easy games </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Gianluigi Greco and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In Joseph Y. Halpern and Moshe Tennenholtz, editors,
             
            <em>
            Proceedings of the 9th Conference on Theoretical Aspects of Rationality and Knowledge (TARK&#x2212;2003)&#x201a; Bloomington&#x201a; Indiana&#x201a; USA&#x201a; June 20&#x2212;22&#x201a; 2003</em>.
        
                Pages 215&#x2212;230.
            ACM.
        2003.
        </p>
	
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            		href="/publications/publication161-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1145/846241.846269">
		DOI (10.1145/846241.846269)
		</a> 
		
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	</div> 
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            IJCAI&#x2212;03&#x201a; Proceedings of the Eighteenth International Joint Conference on Artificial Intelligence&#x201a; Acapulco&#x201a; Mexico&#x201a; August 9&#x2212;15&#x201a; 2003 </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Toby Walsh, editors  </em> </p>
	
	<p class="publicationDetails"> </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication155-abstract.html">
			Details <span class="sr-only" > about <em> IJCAI&#x2212;03&#x201a; Proceedings of the Eighteenth International Joint Conference on Artificial Intelligence&#x201a; Acapulco&#x201a; Mexico&#x201a; August 9&#x2212;15&#x201a; 2003  </em></span> </a> |
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			BibTeX  <span class="sr-only" > data for <em> IJCAI&#x2212;03&#x201a; Proceedings of the Eighteenth International Joint Conference on Artificial Intelligence&#x201a; Acapulco&#x201a; Mexico&#x201a; August 9&#x2212;15&#x201a; 2003  </em></span>   </a>
			
			
		
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Datalog LITE: a deductive query language with linear time model checking </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Erich Gr&#xe4;del and Helmut Veith  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>ACM Trans. Comput. Log.</em>.
        
            Vol. 3.
        
            No. 1.
        
                Pages 42&#x2212;79.
            2002.
        </p>
	
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            		href="/publications/publication178-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1145/504077.504079">
		DOI (10.1145/504077.504079)
		</a> 
		
		</div> 
	</div> 
	
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Fixed&#x2212;parameter complexity in AI and nonmonotonic reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Francesco Scarcello and Martha Sideri  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Artif. Intell.</em>.
        
            Vol. 138.
        
            No. 1&#x2212;2.
        
                Pages 55&#x2212;86.
            2002.
        </p>
	
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            		href="/publications/publication179-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1016/S0004-3702(02)00182-0">
		DOI (10.1016/S0004-3702(02)00182-0)
		</a> 
		
		</div> 
	</div> 
	
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		<div
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		>
			
	
	<p class="publicationTitle"> <strong>
            Complexity of Nested Circumscription and Nested Abnormality Theories </strong> </p>
	    <p class="publicationAuthors"> <em> Marco Cadoli&#x201a; Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>CoRR</em>.
        
            Vol. cs.AI/0207072.
        2002.
        </p>
	
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					| <a href="http://arxiv.org/abs/cs.AI/0207072"> Link <span class="sr-only" > to <em> Complexity of Nested Circumscription and Nested Abnormality Theories  </em></span> </a>
  				
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            The DLV System for Knowledge Representation and Reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Nicola Leone&#x201a; Gerald Pfeifer&#x201a; Wolfgang Faber&#x201a; Thomas Eiter&#x201a; Georg Gottlob&#x201a; Simona Perri and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>CoRR</em>.
        
            Vol. cs.AI/0211004.
        2002.
        </p>
	
        		<p class="publicationlinks"> <a
        
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					| <a href="http://arxiv.org/abs/cs.AI/0211004"> Link <span class="sr-only" > to <em> The DLV System for Knowledge Representation and Reasoning  </em></span> </a>
  				
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            Monadic Datalog and the Expressive Power of Languages for Web Information Extraction </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Christoph Koch  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>CoRR</em>.
        
            Vol. cs.DB/0211020.
        2002.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            New Results on Monotone Dualization and Generating Hypergraph Transversals </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Kazuhisa Makino  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>CoRR</em>.
        
            Vol. cs.DS/0204009.
        2002.
        </p>
	
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            		href="/publications/publication183-abstract.html">
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					| <a href="http://arxiv.org/abs/cs.DS/0204009"> Link <span class="sr-only" > to <em> New Results on Monotone Dualization and Generating Hypergraph Transversals  </em></span> </a>
  				
		
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Hypertree Decompositions and Tractable Queries </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Comput. Syst. Sci.</em>.
        
            Vol. 64.
        
            No. 3.
        
                Pages 579&#x2212;627.
            2002.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication184-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1006/jcss.2001.1809">
		DOI (10.1006/jcss.2001.1809)
		</a> 
		
		</div> 
	</div> 
	
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Computing LOGCFL certificates </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Theor. Comput. Sci.</em>.
        
            Vol. 270.
        
            No. 1&#x2212;2.
        
                Pages 761&#x2212;777.
            2002.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication185-abstract.html">
			Details <span class="sr-only" > about <em> Computing LOGCFL certificates  </em></span> </a> |
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			 | <a
		href="http://dx.doi.org/10.1016/S0304-3975(01)00108-6">
		DOI (10.1016/S0304-3975(01)00108-6)
		</a> 
		
		</div> 
	</div> 
	
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Propositional default logics made easier: computational complexity of model checking </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Theor. Comput. Sci.</em>.
        
            Vol. 289.
        
            No. 1.
        
                Pages 591&#x2212;627.
            2002.
        </p>
	
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            		href="/publications/publication186-abstract.html">
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Multiagent Compromises&#x201a; Joint Fixpoints&#x201a; and Stable Models </strong> </p>
	    <p class="publicationAuthors"> <em> Francesco Buccafurri and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Antonis C. Kakas and Fariba Sadri, editors,
             
            <em>
            Computational Logic: Logic Programming and Beyond&#x201a; Essays in Honour of Robert A. Kowalski&#x201a; Part I</em>.
        
            Vol. 2407
                of Lecture Notes in Computer Science.
        
                Pages 561&#x2212;585.
            Springer.
        2002.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication169-abstract.html">
			Details <span class="sr-only" > about <em> Multiagent Compromises&#x201a; Joint Fixpoints&#x201a; and Stable Models  </em></span> </a> |
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					| <a href="http://link.springer.de/link/service/series/0558/bibs/2407/24070561.htm"> Link <span class="sr-only" > to <em> Multiagent Compromises&#x201a; Joint Fixpoints&#x201a; and Stable Models  </em></span> </a>
  				
		
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		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Combining hypertree&#x201a; bicomp&#x201a; and hinge decomposition </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Martin Hutle and Franz Wotawa  </em> </p>
	
	<p class="publicationDetails"> 
            In Frank van Harmelen, editor,
             
            <em>
            Proceedings of the 15th Eureopean Conference on Artificial Intelligence&#x201a; ECAI'2002&#x201a; Lyon&#x201a; France&#x201a; July 2002</em>.
        
                Pages 161&#x2212;165.
            IOS Press.
        2002.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication170-abstract.html">
			Details <span class="sr-only" > about <em> Combining hypertree&#x201a; bicomp&#x201a; and hinge decomposition  </em></span> </a> |
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		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            The DLV System </strong> </p>
	    <p class="publicationAuthors"> <em> Nicola Leone&#x201a; Gerald Pfeifer&#x201a; Wolfgang Faber&#x201a; Francesco Calimeri&#x201a; Tina Dell'Armi&#x201a; Thomas Eiter&#x201a; Georg Gottlob&#x201a; Giovambattista Ianni&#x201a; Giuseppe Ielpa&#x201a; Christoph Koch&#x201a; Simona Perri and Axel Polleres  </em> </p>
	
	<p class="publicationDetails"> 
            In Sergio Flesca&#x201a; Sergio Greco&#x201a; Nicola Leone and Giovambattista Ianni, editors,
             
            <em>
            Logics in Artificial Intelligence&#x201a; European Conference&#x201a; JELIA 2002&#x201a; Cosenza&#x201a; Italy&#x201a; September&#x201a; 23&#x2212;26&#x201a; Proceedings</em>.
        
            Vol. 2424
                of Lecture Notes in Computer Science.
        
                Pages 537&#x2212;540.
            Springer.
        2002.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication171-abstract.html">
			Details <span class="sr-only" > about <em> The DLV System  </em></span> </a> |
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					| <a href="http://link.springer.de/link/service/series/0558/bibs/2424/24240537.htm"> Link <span class="sr-only" > to <em> The DLV System  </em></span> </a>
  				
		
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	</div> 
	
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		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Hypergraph Transversal Computation and Related Problems in Logic and AI </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Sergio Flesca&#x201a; Sergio Greco&#x201a; Nicola Leone and Giovambattista Ianni, editors,
             
            <em>
            Logics in Artificial Intelligence&#x201a; European Conference&#x201a; JELIA 2002&#x201a; Cosenza&#x201a; Italy&#x201a; September&#x201a; 23&#x2212;26&#x201a; Proceedings</em>.
        
            Vol. 2424
                of Lecture Notes in Computer Science.
        
                Pages 549&#x2212;564.
            Springer.
        2002.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication172-abstract.html">
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					| <a href="http://link.springer.de/link/service/series/0558/bibs/2424/24240549.htm"> Link <span class="sr-only" > to <em> Hypergraph Transversal Computation and Related Problems in Logic and AI  </em></span> </a>
  				
		
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Monadic Queries over Tree&#x2212;Structured Data </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Christoph Koch  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            17th IEEE Symposium on Logic in Computer Science (LICS 2002)&#x201a; 22&#x2212;25 July 2002&#x201a; Copenhagen&#x201a; Denmark&#x201a; Proceedings</em>.
        
                Pages 189&#x2212;202.
            IEEE Computer Society.
        2002.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication173-abstract.html">
			Details <span class="sr-only" > about <em> Monadic Queries over Tree&#x2212;Structured Data  </em></span> </a> |
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			 | <a
		href="http://dx.doi.org/10.1109/LICS.2002.1029828">
		DOI (10.1109/LICS.2002.1029828)
		</a> 
		
		</div> 
	</div> 
	
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		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Visual Data Extraction Through Visual Logic Programming </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Salem Benferhat and Enrico Giunchiglia, editors,
             
            <em>
            9th International Workshop on Non&#x2212;Monotonic Reasoning (NMR 2002)&#x201a; April 19&#x2212;21&#x201a; Toulouse&#x201a; France&#x201a; Proceedings</em>.
        
                Pages 4.
            2002.
        </p>
	
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		<div
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		>
			
	
	<p class="publicationTitle"> <strong>
            Monadic Datalog and the Expressive Power of Languages for Web Information Extraction </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Christoph Koch  </em> </p>
	
	<p class="publicationDetails"> 
            In Lucian Popa, editor,
             
            <em>
            Proceedings of the Twenty&#x2212;first ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; June 3&#x2212;5&#x201a; Madison&#x201a; Wisconsin&#x201a; USA</em>.
        
                Pages 17&#x2212;28.
            ACM.
        2002.
        </p>
	
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		DOI (10.1145/543613.543617)
		</a> 
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		>
			
	
	<p class="publicationTitle"> <strong>
            New results on monotone dualization and generating hypergraph transversals </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Kazuhisa Makino  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            STOC</em>.
        
                Pages 14&#x2212;22.
            2002.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Efficient Algorithms for Processing XPath Queries </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Christoph Koch and Reinhard Pichler  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            VLDB 2002&#x201a; Proceedings of 28th International Conference on Very Large Data Bases&#x201a; August 20&#x2212;23&#x201a; 2002&#x201a; Hong Kong&#x201a; China</em>.
        
                Pages 95&#x2212;106.
            Morgan Kaufmann.
        2002.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Complexity and expressive power of logic programming </strong> </p>
	    <p class="publicationAuthors"> <em> Evgeny Dantsin&#x201a; Thomas Eiter&#x201a; Georg Gottlob and Andrei Voronkov  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>ACM Comput. Surv.</em>.
        
            Vol. 33.
        
            No. 3.
        
                Pages 374&#x2212;425.
            2001.
        </p>
	
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			 | <a
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		DOI (10.1145/502807.502810)
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	<p class="publicationTitle"> <strong>
            Working with ARMs: Complexity Results on Atomic Representations of Herbrand Models </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Reinhard Pichler  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Inf. Comput.</em>.
        
            Vol. 165.
        
            No. 2.
        
                Pages 183&#x2212;207.
            2001.
        </p>
	
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			 | <a
		href="http://dx.doi.org/10.1006/inco.2000.2915">
		DOI (10.1006/inco.2000.2915)
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	<p class="publicationTitle"> <strong>
            The complexity of acyclic conjunctive queries </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. ACM</em>.
        
            Vol. 48.
        
            No. 3.
        
                Pages 431&#x2212;498.
            2001.
        </p>
	
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			 | <a
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		DOI (10.1145/382780.382783)
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		>
			
	
	<p class="publicationTitle"> <strong>
            On ACTL Formulas Having Linear Counterexamples </strong> </p>
	    <p class="publicationAuthors"> <em> Francesco Buccafurri&#x201a; Thomas Eiter&#x201a; Georg Gottlob and Nicola Leone  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Comput. Syst. Sci.</em>.
        
            Vol. 62.
        
            No. 3.
        
                Pages 463&#x2212;515.
            2001.
        </p>
	
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            		href="/publications/publication202-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Second&#x2212;Order Logic over Strings: Regular and Non&#x2212;regular Fragments </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Thomas Schwentick  </em> </p>
	
	<p class="publicationDetails"> 
            In Werner Kuich&#x201a; Grzegorz Rozenberg and Arto Salomaa, editors,
             
            <em>
            Developments in Language Theory&#x201a; 5th International Conference&#x201a; DLT 2001&#x201a; Vienna&#x201a; Austria&#x201a; July 16&#x2212;21&#x201a; 2001&#x201a; Revised Papers</em>.
        
            Vol. 2295
                of Lecture Notes in Computer Science.
        
                Pages 37&#x2212;56.
            Springer.
        2001.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Hypergraphs in Model Checking: Acyclicity and Hypertree&#x2212;Width versus Clique&#x2212;Width </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Reinhard Pichler  </em> </p>
	
	<p class="publicationDetails"> 
            In Fernando Orejas&#x201a; Paul G. Spirakis and Jan van Leeuwen, editors,
             
            <em>
            Automata&#x201a; Languages and Programming&#x201a; 28th International Colloquium&#x201a; ICALP 2001&#x201a; Crete&#x201a; Greece&#x201a; July 8&#x2212;12&#x201a; 2001&#x201a; Proceedings</em>.
        
            Vol. 2076
                of Lecture Notes in Computer Science.
        
                Pages 708&#x2212;719.
            Springer.
        2001.
        </p>
	
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            		href="/publications/publication188-abstract.html">
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	<p class="publicationTitle"> <strong>
            Complexity of Nested Circumscription and Abnormality Theories </strong> </p>
	    <p class="publicationAuthors"> <em> Marco Cadoli&#x201a; Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Bernhard Nebel, editor,
             
            <em>
            Proceedings of the Seventeenth International Joint Conference on Artificial Intelligence&#x201a; IJCAI 2001&#x201a; Seattle&#x201a; Washington&#x201a; USA&#x201a; August 4&#x2212;10&#x201a; 2001</em>.
        
                Pages 169&#x2212;174.
            Morgan Kaufmann.
        2001.
        </p>
	
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	<p class="publicationTitle"> <strong>
            The Elog Web Extraction Language </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner&#x201a; Sergio Flesca and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Robert Nieuwenhuis and Andrei Voronkov, editors,
             
            <em>
            Logic for Programming&#x201a; Artificial Intelligence&#x201a; and Reasoning&#x201a; 8th International Conference&#x201a; LPAR 2001&#x201a; Havana&#x201a; Cuba&#x201a; December 3&#x2212;7&#x201a; 2001&#x201a; Proceedings</em>.
        
            Vol. 2250
                of Lecture Notes in Computer Science.
        
                Pages 548&#x2212;560.
            Springer.
        2001.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Declarative Information Extraction&#x201a; Web Crawling&#x201a; and Recursive Wrapping with Lixto </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner&#x201a; Sergio Flesca and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Thomas Eiter&#x201a; Wolfgang Faber and Miroslaw Truszczynski, editors,
             
            <em>
            Logic Programming and Nonmonotonic Reasoning&#x201a; 6th International Conference&#x201a; LPNMR 2001&#x201a; Vienna&#x201a; Austria&#x201a; September 17&#x2212;19&#x201a; 2001&#x201a; Proceedings</em>.
        
            Vol. 2173
                of Lecture Notes in Computer Science.
        
                Pages 21&#x2212;41.
            Springer.
        2001.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Hypertree Decompositions: A Survey </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In Jiri Sgall&#x201a; Ales Pultr and Petr Kolman, editors,
             
            <em>
            Mathematical Foundations of Computer Science 2001&#x201a; 26th International Symposium&#x201a; MFCS 2001 Marianske Lazne&#x201a; Czech Republic&#x201a; August 27&#x2212;31&#x201a; 2001&#x201a; Proceedings</em>.
        
            Vol. 2136
                of Lecture Notes in Computer Science.
        
                Pages 37&#x2212;57.
            Springer.
        2001.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Robbers&#x201a; Marshals&#x201a; and Guards: Game Theoretic and Logical Characterizations of Hypertree Width </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the Twentieth ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; May 21&#x2212;23&#x201a; 2001&#x201a; Santa Barbara&#x201a; California&#x201a; USA</em>.
        ACM.
        2001.
        </p>
	
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		DOI (10.1145/375551.375579)
		</a> 
					| <a href="http://www.acm.org/sigs/sigmod/pods/proc01/online/p68.pdf"> Download (pdf)  <span class="sr-only" > of <em> Robbers&#x201a; Marshals&#x201a; and Guards: Game Theoretic and Logical Characterizations of Hypertree Width  </em></span>   </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Robbers&#x201a; Marshals&#x201a; and Guards: Game Theoretic and Logical Characterizations of Hypertree Width </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            SEBD</em>.
        
                Pages 147&#x2212;154.
            2001.
        </p>
	
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            		href="/publications/publication194-abstract.html">
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	<p class="publicationTitle"> <strong>
            The Lixto Wrapper Generation Tool </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            SEBD</em>.
        
                Pages 3&#x2212;10.
            2001.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication195-abstract.html">
			Details <span class="sr-only" > about <em> The Lixto Wrapper Generation Tool  </em></span> </a> |
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	<p class="publicationTitle"> <strong>
            InfoPipes: A Flexible Framework for M&#x2212;Commerce Applications </strong> </p>
	    <p class="publicationAuthors"> <em> Marcus Herzog and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Fabio Casati&#x201a; Dimitrios Georgakopoulos and Ming&#x2212;Chien Shan, editors,
             
            <em>
            Technologies for E&#x2212;Services&#x201a; Second International Workshop&#x201a; TES 2001&#x201a; Rome&#x201a; Italy&#x201a; September 14&#x2212;15&#x201a; 2001&#x201a; Proceedings</em>.
        
            Vol. 2193
                of Lecture Notes in Computer Science.
        
                Pages 175&#x2212;186.
            Springer.
        2001.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Visual Web Information Extraction with Lixto </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner&#x201a; Sergio Flesca and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Peter M. G. Apers&#x201a; Paolo Atzeni&#x201a; Stefano Ceri&#x201a; Stefano Paraboschi&#x201a; Kotagiri Ramamohanarao and Richard T. Snodgrass, editors,
             
            <em>
            VLDB 2001&#x201a; Proceedings of 27th International Conference on Very Large Data Bases&#x201a; September 11&#x2212;14&#x201a; 2001&#x201a; Roma&#x201a; Italy</em>.
        
                Pages 119&#x2212;128.
            Morgan Kaufmann.
        2001.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Supervised Wrapper Generation with Lixto </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner&#x201a; Sergio Flesca and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Peter M. G. Apers&#x201a; Paolo Atzeni&#x201a; Stefano Ceri&#x201a; Stefano Paraboschi&#x201a; Kotagiri Ramamohanarao and Richard T. Snodgrass, editors,
             
            <em>
            VLDB 2001&#x201a; Proceedings of 27th International Conference on Very Large Data Bases&#x201a; September 11&#x2212;14&#x201a; 2001&#x201a; Roma&#x201a; Italy</em>.
        
                Pages 715&#x2212;716.
            Morgan Kaufmann.
        2001.
        </p>
	
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	<p class="publicationTitle"> <strong>
            A comparison of structural CSP decomposition methods </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Artif. Intell.</em>.
        
            Vol. 124.
        
            No. 2.
        
                Pages 243&#x2212;282.
            2000.
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            		href="/publications/publication205-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1016/S0004-3702(00)00078-3">
		DOI (10.1016/S0004-3702(00)00078-3)
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	<p class="publicationTitle"> <strong>
            Existential second&#x2212;order logic over strings </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Yuri Gurevich and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. ACM</em>.
        
            Vol. 47.
        
            No. 1.
        
                Pages 77&#x2212;131.
            2000.
        </p>
	
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            		href="/publications/publication206-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1145/331605.331609">
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	<p class="publicationTitle"> <strong>
            Existential Second&#x2212;Order Logic over Graphs: Charting the Tractability Frontier </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Phokion G. Kolaitis and Thomas Schwentick  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            FOCS</em>.
        
                Pages 664&#x2212;674.
            2000.
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            		href="/publications/publication203-abstract.html">
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	<p class="publicationTitle"> <strong>
            On the Complexity of Theory Curbing </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Michel Parigot and Andrei Voronkov, editors,
             
            <em>
            Logic for Programming and Automated Reasoning&#x201a; 7th International Conference&#x201a; LPAR 2000&#x201a; Reunion Island&#x201a; France&#x201a; November 11&#x2212;12&#x201a; 2000&#x201a; Proceedings</em>.
        
            Vol. 1955
                of Lecture Notes in Computer Science.
        
                Pages 1&#x2212;19.
            Springer.
        2000.
        </p>
	
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            		href="/publications/publication204-abstract.html">
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					| <a href="http://link.springer.de/link/service/series/0558/bibs/1955/19550001.htm"> Link <span class="sr-only" > to <em> On the Complexity of Theory Curbing  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Succinctness as a Source of Complexity in Logical Formalisms </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Helmut Veith  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Ann. Pure Appl. Logic</em>.
        
            Vol. 97.
        
            No. 1&#x2212;3.
        
                Pages 231&#x2212;260.
            1999.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Enhancing Model Checking in Verification by AI Techniques </strong> </p>
	    <p class="publicationAuthors"> <em> Francesco Buccafurri&#x201a; Thomas Eiter&#x201a; Georg Gottlob and Nicola Leone  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Artif. Intell.</em>.
        
            Vol. 112.
        
            No. 1&#x2212;2.
        
                Pages 57&#x2212;104.
            1999.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication218-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1016/S0004-3702(99)00039-9">
		DOI (10.1016/S0004-3702(99)00039-9)
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	<p class="publicationTitle"> <strong>
            On the Complexity of Some Inductive Logic Programming Problems </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>New Generation Comput.</em>.
        
            Vol. 17.
        
            No. 1.
        
                Pages 53&#x2212;75.
            1999.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication219-abstract.html">
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	<p class="publicationTitle"> <strong>
            On Tractable Queries and Constraints </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In Trevor J. M. Bench&#x2212;Capon&#x201a; Giovanni Soda and A. Min Tjoa, editors,
             
            <em>
            Database and Expert Systems Applications&#x201a; 10th International Conference&#x201a; DEXA '99&#x201a; Florence&#x201a; Italy&#x201a; August 30 &#x2212; September 3&#x201a; 1999&#x201a; Proceedings</em>.
        
            Vol. 1677
                of Lecture Notes in Computer Science.
        
                Pages 1&#x2212;15.
            Springer.
        1999.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication208-abstract.html">
			Details <span class="sr-only" > about <em> On Tractable Queries and Constraints  </em></span> </a> |
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		>
			
	
	<p class="publicationTitle"> <strong>
            Computing LOGCFL Certificates </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In Jir&#xed; Wiedermann&#x201a; Peter van Emde Boas and Mogens Nielsen, editors,
             
            <em>
            Automata&#x201a; Languages and Programming&#x201a; 26th International Colloquium&#x201a; ICALP'99&#x201a; Prague&#x201a; Czech Republic&#x201a; July 11&#x2212;15&#x201a; 1999&#x201a; Proceedings</em>.
        
            Vol. 1644
                of Lecture Notes in Computer Science.
        
                Pages 361&#x2212;371.
            Springer.
        1999.
        </p>
	
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            		href="/publications/publication209-abstract.html">
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					| <a href="http://link.springer.de/link/service/series/0558/bibs/1644/16440361.htm"> Link <span class="sr-only" > to <em> Computing LOGCFL Certificates  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            A Comparison of Structural CSP Decomposition Methods </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In Thomas Dean, editor,
             
            <em>
            Proceedings of the Sixteenth International Joint Conference on Artificial Intelligence&#x201a; IJCAI 99&#x201a; Stockholm&#x201a; Sweden&#x201a; July 31 &#x2212; August 6&#x201a; 1999. 2 Volumes&#x201a; 1450 pages</em>.
        
                Pages 394&#x2212;399.
            Morgan Kaufmann.
        1999.
        </p>
	
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            		href="/publications/publication210-abstract.html">
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	<p class="publicationTitle"> <strong>
            On the Complexity of Model Checking for Propositional Default Logics: New Results and Tractable Cases </strong> </p>
	    <p class="publicationAuthors"> <em> Robert Baumgartner and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Thomas Dean, editor,
             
            <em>
            Proceedings of the Sixteenth International Joint Conference on Artificial Intelligence&#x201a; IJCAI 99&#x201a; Stockholm&#x201a; Sweden&#x201a; July 31 &#x2212; August 6&#x201a; 1999. 2 Volumes&#x201a; 1450 pages</em>.
        
                Pages 64&#x2212;69.
            Morgan Kaufmann.
        1999.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication211-abstract.html">
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	<p class="publicationTitle"> <strong>
            Working with Arms: Complexity Results on Atomic Representations of Herbrand Models </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Reinhard Pichler  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            LICS</em>.
        
                Pages 306&#x2212;315.
            1999.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication212-abstract.html">
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	<p class="publicationTitle"> <strong>
            On the Complexity of Single&#x2212;Rule Datalog Queries </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Christos H. Papadimitriou  </em> </p>
	
	<p class="publicationDetails"> 
            In Harald Ganzinger&#x201a; David A. McAllester and Andrei Voronkov, editors,
             
            <em>
            Logic Programming and Automated Reasoning&#x201a; 6th International Conference&#x201a; LPAR'99&#x201a; Tbilisi&#x201a; Georgia&#x201a; September 6&#x2212;10&#x201a; 1999&#x201a; Proceedings</em>.
        
            Vol. 1705
                of Lecture Notes in Computer Science.
        
                Pages 201&#x2212;222.
            Springer.
        1999.
        </p>
	
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            		href="/publications/publication213-abstract.html">
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	<p class="publicationTitle"> <strong>
            Fixed&#x2212;Parameter Complexity in AI and Nonmonotonic Reasoning </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Francesco Scarcello and Martha Sideri  </em> </p>
	
	<p class="publicationDetails"> 
            In Michael Gelfond&#x201a; Nicola Leone and Gerald Pfeifer, editors,
             
            <em>
            Logic Programming and Nonmonotonic Reasoning&#x201a; 5th International Conference&#x201a; LPNMR'99&#x201a; El Paso&#x201a; Texas&#x201a; USA&#x201a; December 2&#x2212;4&#x201a; 1999&#x201a; Proceedings</em>.
        
            Vol. 1730
                of Lecture Notes in Computer Science.
        
                Pages 1&#x2212;18.
            Springer.
        1999.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication214-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Hypertree Decompositions and Tractable Queries </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the Eighteenth ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; May 31 &#x2212; June 2&#x201a; 1999&#x201a; Philadelphia&#x201a; Pennsylvania</em>.
        
                Pages 21&#x2212;32.
            ACM Press.
        1999.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Hypertree Decompositions and Tractable Queries </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            SEBD</em>.
        
                Pages 275&#x2212;289.
            1999.
        </p>
	
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            		href="/publications/publication216-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Computer Science Logic&#x201a; 12th International Workshop&#x201a; CSL '98&#x201a; Annual Conference of the EACSL&#x201a; Brno&#x201a; Czech Republic&#x201a; August 24&#x2212;28&#x201a; 1998&#x201a; Proceedings </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Etienne Grandjean and Katrin Seyr, editors  </em> </p>
	
	<p class="publicationDetails"> </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Hypertree Decompositions and Tractable Queries </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>CoRR</em>.
        
            Vol. cs.DB/9812022.
        1998.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            On the Expressiveness of Frame Satisfiability and Fragments of Second&#x2212;Order Logic </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Symb. Log.</em>.
        
            Vol. 63.
        
            No. 1.
        
                Pages 73&#x2212;82.
            1998.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Capturing Relativized Complexity Classes without Order </strong> </p>
	    <p class="publicationAuthors"> <em> Anuj Dawar&#x201a; Georg Gottlob and Lauri Hella  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Math. Log. Q.</em>.
        
            Vol. 44.
        
                Pages 109&#x2212;122.
            1998.
        </p>
	
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            		href="/publications/publication224-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            The Complexity of Acyclic Conjunctive Queries </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            FOCS</em>.
        
                Pages 706&#x2212;715.
            1998.
        </p>
	
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            		href="/publications/publication220-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Existential Second&#x2212;Order Logic over Strings </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Yuri Gurevich  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            LICS</em>.
        
                Pages 16&#x2212;27.
            1998.
        </p>
	
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            		href="/publications/publication221-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Disjunctive Datalog </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Heikki Mannila  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>ACM Trans. Database Syst.</em>.
        
            Vol. 22.
        
            No. 3.
        
                Pages 364&#x2212;418.
            1997.
        </p>
	
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			 | <a
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		DOI (10.1145/261124.261126)
		</a> 
					| <a href="http://www.informatik.uni-trier.de/~ley/db/journals/tods/EiterGM97.html"> Link <span class="sr-only" > to <em> Disjunctive Datalog  </em></span> </a>
  				
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            Semantics and Complexity of Abduction from Default Theories </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Nicola Leone  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Artif. Intell.</em>.
        
            Vol. 90.
        
            No. 1&#x2212;2.
        
                Pages 177&#x2212;223.
            1997.
        </p>
	
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			 | <a
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		DOI (10.1016/S0004-3702(96)00040-9)
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		>
			
	
	<p class="publicationTitle"> <strong>
            Well&#x2212;Founded Semantics for Default Logic </strong> </p>
	    <p class="publicationAuthors"> <em> Gerhard Brewka and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Fundam. Inform.</em>.
        
            Vol. 31.
        
            No. 3/4.
        
                Pages 221&#x2212;236.
            1997.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Default Logic as a Query Language </strong> </p>
	    <p class="publicationAuthors"> <em> Marco Cadoli&#x201a; Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>IEEE Trans. Knowl. Data Eng.</em>.
        
            Vol. 9.
        
            No. 3.
        
                Pages 448&#x2212;463.
            1997.
        </p>
	
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		DOI (http://www.informatik.uni-trier.de/~ley/db/journals/tkde/CadoliEG97.html)
		</a> 
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            On the Indiscernibility of Individuals in Logic Programming </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Nicola Leone  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Log. Comput.</em>.
        
            Vol. 7.
        
            No. 6.
        
                Pages 805&#x2212;824.
            1997.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Expressiveness of Stable Model Semantics for Disjuncitve Logic Programs with Functions </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Log. Program.</em>.
        
            Vol. 33.
        
            No. 2.
        
                Pages 167&#x2212;178.
            1997.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Relativized Logspace and Generalized Quantifiers over Finite Ordered Structures </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Symb. Log.</em>.
        
            Vol. 62.
        
            No. 2.
        
                Pages 545&#x2212;574.
            1997.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Abduction from Logic Programs: Semantics and Complexity </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Nicola Leone  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Theor. Comput. Sci.</em>.
        
            Vol. 189.
        
            No. 1&#x2212;2.
        
                Pages 129&#x2212;177.
            1997.
        </p>
	
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			 | <a
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		DOI (10.1016/S0304-3975(96)00179-X)
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		>
			
	
	<p class="publicationTitle"> <strong>
            Generalized Quantifiers in Logic Programs </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Helmut Veith  </em> </p>
	
	<p class="publicationDetails"> 
            In Jouko A. V&#xe4;&#xe4;n&#xe4;nen, editor,
             
            <em>
            Generalized Quantifiers and Computation&#x201a; 9th European Summer School in Logic&#x201a; Language&#x201a; and Information&#x201a; ESSLLI'97 Workshop&#x201a; Aix&#x2212;en&#x2212;Provence&#x201a; France&#x201a; August 11&#x2212;22&#x201a; 1997&#x201a; Revised Lectures</em>.
        
            Vol. 1754
                of Lecture Notes in Computer Science.
        
                Pages 72&#x2212;98.
            Springer.
        1997.
        </p>
	
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            		href="/publications/publication226-abstract.html">
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	<p class="publicationTitle"> <strong>
            The Complexity Class Theta<span style="font-family: serif"><sub style="font-style: normal">2</sub></span><span style="font-family: serif"><sup style="font-style: normal">p</sup></span>: Recent Results and Applications in AI and Modal Logic </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Bogdan S. Chlebus and Ludwik Czaja, editors,
             
            <em>
            Fundamentals of Computation Theory&#x201a; 11th International Symposium&#x201a; FCT '97&#x201a; Krak&#xf3;w&#x201a; Poland&#x201a; September 1&#x2212;3&#x201a; 1997&#x201a; Proceedings</em>.
        
            Vol. 1279
                of Lecture Notes in Computer Science.
        
                Pages 1&#x2212;18.
            Springer.
        1997.
        </p>
	
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            		href="/publications/publication227-abstract.html">
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	<p class="publicationTitle"> <strong>
            Complexity and Expressive Power of Logic Programming </strong> </p>
	    <p class="publicationAuthors"> <em> Evgeny Dantsin&#x201a; Thomas Eiter&#x201a; Georg Gottlob and Andrei Voronkov  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            IEEE Conference on Computational Complexity</em>.
        
                Pages 82&#x2212;101.
            1997.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication228-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            On the Complexity of Some Inductive Logic Programming Problems </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In Nada Lavrac and Saso Dzeroski, editors,
             
            <em>
            Inductive Logic Programming&#x201a; 7th International Workshop&#x201a; ILP&#x2212;97&#x201a; Prague&#x201a; Czech Republic&#x201a; September 17&#x2212;20&#x201a; 1997&#x201a; Proceedings</em>.
        
            Vol. 1297
                of Lecture Notes in Computer Science.
        
                Pages 17&#x2212;32.
            Springer.
        1997.
        </p>
	
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		<div
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		>
			
	
	<p class="publicationTitle"> <strong>
            Modular Logic Programming and Generalized Quantifiers </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Helmut Veith  </em> </p>
	
	<p class="publicationDetails"> 
            In J&#xfc;rgen Dix&#x201a; Ulrich Furbach and Anil Nerode, editors,
             
            <em>
            Logic Programming and Nonmonotonic Reasoning&#x201a; 4th International Conference&#x201a; LPNMR'97&#x201a; Dagstuhl Castle&#x201a; Germany&#x201a; July 28&#x2212;31&#x201a; 1997&#x201a; Proceedings</em>.
        
            Vol. 1265
                of Lecture Notes in Computer Science.
        
                Pages 290&#x2212;309.
            Springer.
        1997.
        </p>
	
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            The dlv System: Model Generator and Advanced Frontends (system description) </strong> </p>
	    <p class="publicationAuthors"> <em> Simona Citrigno&#x201a; Thomas Eiter&#x201a; Wolfgang Faber&#x201a; Georg Gottlob&#x201a; Christoph Koch&#x201a; Nicola Leone&#x201a; Cristinel Mateis&#x201a; Gerald Pfeifer and Francesco Scarcello  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            WLP</em>.
        
                Pages 0&#x2212;.
            1997.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Computational Logic and Proof Theory&#x201a; 5th Kurt G&#xf6;del Colloquium&#x201a; KGC'97&#x201a; Vienna&#x201a; Austria&#x201a; August 25&#x2212;29&#x201a; 1997&#x201a; Proceedings </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Alexander Leitsch and Daniele Mundici, editors  </em> </p>
	
	<p class="publicationDetails"> </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Extending Object&#x2212;Oriented Systems with Roles </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Michael Schrefl and Brigitte R&#xf6;ck  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>ACM Trans. Inf. Syst.</em>.
        
            Vol. 14.
        
            No. 3.
        
                Pages 268&#x2212;296.
            1996.
        </p>
	
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			 | <a
		href="http://dx.doi.org/10.1145/230538.230540">
		DOI (10.1145/230538.230540)
		</a> 
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            Normal Forms for Second&#x2212;Order Logic over Finite Structures&#x201a; and Classification of NP Optimization Problems </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Yuri Gurevich  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Ann. Pure Appl. Logic</em>.
        
            Vol. 78.
        
            No. 1&#x2212;3.
        
                Pages 111&#x2212;125.
            1996.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Approximating the Stable Model Semantics is Hard </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Miroslaw Truszczynski  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Fundam. Inform.</em>.
        
            Vol. 28.
        
            No. 1&#x2212;2.
        
                Pages 123&#x2212;128.
            1996.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            The Complexity of Nested Counterfactuals and Iterated Knowledge Base Revisions </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Comput. Syst. Sci.</em>.
        
            Vol. 53.
        
            No. 3.
        
                Pages 497&#x2212;512.
            1996.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            M&#xe4;chtigkeit von Logikprogrammierung &#xfc;ber Datenbanken </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>KI</em>.
        
            Vol. 10.
        
            No. 3.
        
                Pages 32&#x2212;39.
            1996.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            A Non&#x2212;Ground Realization of the Stable and Well&#x2212;Founded Semantics </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Sherry Marcus&#x201a; Anil Nerode&#x201a; Gernot Salzer and V. S. Subrahmanian  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Theor. Comput. Sci.</em>.
        
            Vol. 166.
        
            No. 1&2.
        
                Pages 221&#x2212;262.
            1996.
        </p>
	
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			 | <a
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		DOI (10.1016/0304-3975(95)00207-3)
		</a> 
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            The PARK Semantics for Active Rules </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Guido Moerkotte and V. S. Subrahmanian  </em> </p>
	
	<p class="publicationDetails"> 
            In Peter M. G. Apers&#x201a; Mokrane Bouzeghoub and Georges Gardarin, editors,
             
            <em>
            Advances in Database Technology &#x2212; EDBT'96&#x201a; 5th International Conference on Extending Database Technology&#x201a; Avignon&#x201a; France&#x201a; March 25&#x2212;29&#x201a; 1996&#x201a; Proceedings</em>.
        
            Vol. 1057
                of Lecture Notes in Computer Science.
        
                Pages 35&#x2212;55.
            Springer.
        1996.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Collapsing Oracle&#x2212;Tape Hierarchies </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            IEEE Conference on Computational Complexity</em>.
        
                Pages 33&#x2212;42.
            1996.
        </p>
	
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            		href="/publications/publication241-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Complexity and Expressive Power of KR Formalisms (Invited Talk Abstract) </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            KR</em>.
        
                Pages 647&#x2212;649.
            1996.
        </p>
	
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            		href="/publications/publication242-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            On the Computational Cost of Disjunctive Logic Programming: Propositional Case </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Ann. Math. Artif. Intell.</em>.
        
            Vol. 15.
        
            No. 3&#x2212;4.
        
                Pages 289&#x2212;323.
            1995.
        </p>
	
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            		href="/publications/publication256-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            The Complexity of Default Reasoning under the Stationary Fixed Point Semantics </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Inf. Comput.</em>.
        
            Vol. 121.
        
            No. 1.
        
                Pages 81&#x2212;92.
            1995.
        </p>
	
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            		href="/publications/publication257-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            The Complexity of Logic&#x2212;Based Abduction </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. ACM</em>.
        
            Vol. 42.
        
            No. 1.
        
                Pages 3&#x2212;42.
            1995.
        </p>
	
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            		href="/publications/publication258-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1145/200836.200838">
		DOI (10.1145/200836.200838)
		</a> 
					| <a href="http://www.informatik.uni-trier.de/~ley/db/journals/jacm/EiterG95.html"> Link <span class="sr-only" > to <em> The Complexity of Logic&#x2212;Based Abduction  </em></span> </a>
  				
		
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		<div
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		>
			
	
	<p class="publicationTitle"> <strong>
            NP Trees and Carnap's Modal Logic </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. ACM</em>.
        
            Vol. 42.
        
            No. 2.
        
                Pages 421&#x2212;457.
            1995.
        </p>
	
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            		href="/publications/publication259-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1145/201019.201031">
		DOI (10.1145/201019.201031)
		</a> 
		
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Translating Default Logic into Standard Autoepistemic Logic </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. ACM</em>.
        
            Vol. 42.
        
            No. 4.
        
                Pages 711&#x2212;740.
            1995.
        </p>
	
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			 | <a
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		DOI (10.1145/210332.210334)
		</a> 
					| <a href="http://www.informatik.uni-trier.de/~ley/db/journals/jacm/Gottlob95a.html"> Link <span class="sr-only" > to <em> Translating Default Logic into Standard Autoepistemic Logic  </em></span> </a>
  				
		
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Identifying the Minimal Transversals of a Hypergraph and Related Problems </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>SIAM J. Comput.</em>.
        
            Vol. 24.
        
            No. 6.
        
                Pages 1278&#x2212;1304.
            1995.
        </p>
	
        		<p class="publicationlinks"> <a
        
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			Details <span class="sr-only" > about <em> Identifying the Minimal Transversals of a Hypergraph and Related Problems  </em></span> </a> |
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	<p class="publicationTitle"> <strong>
            Semantics and Complexity of Abduction from Default Theories </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Nicola Leone  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            IJCAI (1)</em>.
        
                Pages 870&#x2212;877.
            1995.
        </p>
	
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            		href="/publications/publication251-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Relativized Logspace and Generalized Quantifiers over Finite Structures </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings&#x201a; Tenth Annual IEEE Symposium on Logic in Computer Science&#x201a; 26&#x2212;29 June 1995&#x201a; San Diego&#x201a; California&#x201a; USA</em>.
        
                Pages 65&#x2212;78.
            IEEE Computer Society.
        1995.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Complexity Results for Abductive Logic Programming </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Nicola Leone  </em> </p>
	
	<p class="publicationDetails"> 
            In V. Wiktor Marek and Anil Nerode, editors,
             
            <em>
            Logic Programming and Nonmonotonic Reasoning&#x201a; Third International Conference&#x201a; LPNMR'95&#x201a; Lexington&#x201a; KY&#x201a; USA&#x201a; June 26&#x2212;28&#x201a; 1995&#x201a; Proceedings</em>.
        
            Vol. 928
                of Lecture Notes in Computer Science.
        
                Pages 1&#x2212;14.
            Springer.
        1995.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Second Order Logic and the Weak Exponential Hierarchies </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Nicola Leone and Helmut Veith  </em> </p>
	
	<p class="publicationDetails"> 
            In Jir&#xed; Wiedermann and Petr H&#xe1;jek, editors,
             
            <em>
            Mathematical Foundations of Computer Science 1995&#x201a; 20th International Symposium&#x201a; MFCS'95&#x201a; Prague&#x201a; Czech Republic&#x201a; August 28 &#x2212; September 1&#x201a; 1995&#x201a; Proceedings</em>.
        
            Vol. 969
                of Lecture Notes in Computer Science.
        
                Pages 66&#x2212;81.
            Springer.
        1995.
        </p>
	
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	<p class="publicationTitle"> <strong>
            The Evolving Algebra Semantics of Class and Role Hierarchies </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Gerti Kappel and Michael Schrefl  </em> </p>
	
	<p class="publicationDetails"> 
            In Leonid Libkin and Bernhard Thalheim, editors,
             
            <em>
            Semantics in Databases&#x201a; Selected Papers from a Workshop&#x201a; Prague&#x201a; Czech Republic&#x201a; 1995</em>.
        
            Vol. 1358
                of Lecture Notes in Computer Science.
        
                Pages 92&#x2212;113.
            Springer.
        1995.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Database Theory &#x2212; ICDT'95&#x201a; 5th International Conference&#x201a; Prague&#x201a; Czech Republic&#x201a; January 11&#x2212;13&#x201a; 1995&#x201a; Proceedings </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Moshe Y. Vardi, editors  </em> </p>
	
	<p class="publicationDetails"> </p>
	
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	<p class="publicationTitle"> <strong>
            Formalizing the Repair Process &#x2212; Extended Report </strong> </p>
	    <p class="publicationAuthors"> <em> Gerhard Friedrich&#x201a; Georg Gottlob and Wolfgang Nejdl  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Ann. Math. Artif. Intell.</em>.
        
            Vol. 11.
        
            No. 1&#x2212;4.
        
                Pages 187&#x2212;201.
            1994.
        </p>
	
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            		href="/publications/publication269-abstract.html">
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	<p class="publicationTitle"> <strong>
            Cumulative Default Logic: Finite Characterization&#x201a; Algorithms&#x201a; and Complexity </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Zhang Mingyi  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Artif. Intell.</em>.
        
            Vol. 69.
        
            No. 1&#x2212;2.
        
                Pages 329&#x2212;345.
            1994.
        </p>
	
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            		href="/publications/publication270-abstract.html">
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	<p class="publicationTitle"> <strong>
            Disjunctive Logic Programming over Finite Structures </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Heikki Mannila  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            GI Jahrestagung</em>.
        
                Pages 69&#x2212;73.
            1994.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Causal Models of Disjunctive Logic Programs </strong> </p>
	    <p class="publicationAuthors"> <em> J&#xfc;rgen Dix&#x201a; Georg Gottlob and V. Wiktor Marek  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            ICLP</em>.
        
                Pages 290&#x2212;302.
            1994.
        </p>
	
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            		href="/publications/publication263-abstract.html">
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	<p class="publicationTitle"> <strong>
            Expressive Power and Complexity of Disjunctive Datalog under the Stable Model Semantics </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Heikki Mannila  </em> </p>
	
	<p class="publicationDetails"> 
            In Kai von Luck and Heinz Marburger, editors,
             
            <em>
            Management and Processing of Complex Data Structures&#x201a; Third Workshop on Information Systems and Artificial Intelligence&#x201a; Hamburg&#x201a; Germany&#x201a; February 28 &#x2212; March 2&#x201a; 1994&#x201a; Proceedings</em>.
        
            Vol. 777
                of Lecture Notes in Computer Science.
        
                Pages 83&#x2212;103.
            Springer.
        1994.
        </p>
	
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	<p class="publicationTitle"> <strong>
            From Carnap's Modal Logic to Autoepistemic Logic </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Craig MacNish&#x201a; David Pearce and Lu&#xed;s Moniz Pereira, editors,
             
            <em>
            Logics in Artificial Intelligence&#x201a; European Workshop&#x201a; JELIA '94&#x201a; York&#x201a; UK&#x201a; September 5&#x2212;8&#x201a; 1994&#x201a; Proceedings</em>.
        
            Vol. 838
                of Lecture Notes in Computer Science.
        
                Pages 1&#x2212;18.
            Springer.
        1994.
        </p>
	
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            		href="/publications/publication265-abstract.html">
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		<div
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	<p class="publicationTitle"> <strong>
            Default Logic as a Query Language </strong> </p>
	    <p class="publicationAuthors"> <em> Marco Cadoli&#x201a; Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            KR</em>.
        
                Pages 99&#x2212;108.
            1994.
        </p>
	
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            		href="/publications/publication266-abstract.html">
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		<div
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		>
			
	
	<p class="publicationTitle"> <strong>
            Adding Disjunction to Datalog </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Heikki Mannila  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the Thirteenth ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; May 24&#x2212;26&#x201a; 1994&#x201a; Minneapolis&#x201a; Minnesota</em>.
        
                Pages 267&#x2212;278.
            ACM Press.
        1994.
        </p>
	
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            		href="/publications/publication267-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1145/182591.182639">
		DOI (10.1145/182591.182639)
		</a> 
					| <a href="http://www.informatik.uni-trier.de/~ley/db/conf/pods/pods94-267.html"> Link <span class="sr-only" > to <em> Adding Disjunction to Datalog  </em></span> </a>
  				
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            Complexity and Expressive Power of Disjunctive Logic Programming </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            SLP</em>.
        
                Pages 23&#x2212;42.
            1994.
        </p>
	
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            		href="/publications/publication268-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            The Power of Beliefs or Translating Default Logic into Standard Autoepistemic Logic </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Gerhard Lakemeyer and Bernhard Nebel, editors,
             
            <em>
            Foundation of Knowledge Representation and Reasoning (the book grew out of an ECAI&#x2212;92 workshop)</em>.
        
            Vol. 810
                of Lecture Notes in Computer Science.
        
                Pages 133&#x2212;144.
            Springer.
        1994.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Removing Redundancy from a Clause </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Christian G. Ferm&#xfc;ller  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Artif. Intell.</em>.
        
            Vol. 61.
        
            No. 2.
        
                Pages 263&#x2212;289.
            1993.
        </p>
	
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            		href="/publications/publication280-abstract.html">
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	<p class="publicationTitle"> <strong>
            Propositional Circumscription and Extended Closed&#x2212;World Reasoning are IIp2&#x2212;Complete </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Theor. Comput. Sci.</em>.
        
            Vol. 114.
        
            No. 2.
        
                Pages 231&#x2212;245.
            1993.
        </p>
	
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            		href="/publications/publication281-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            NP Trees and Carnap's Modal Logic </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            34th Annual Symposium on Foundations of Computer Science&#x201a; 3&#x2212;5 November 1993&#x201a; Palo Alto&#x201a; California&#x201a; USA</em>.
        
                Pages 42&#x2212;51.
            IEEE.
        1993.
        </p>
	
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            		href="/publications/publication272-abstract.html">
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	<p class="publicationTitle"> <strong>
            The Complexity of Nested Counterfactuals and Iterated Knowledge Base Revisions </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            IJCAI</em>.
        
                Pages 526&#x2212;533.
            1993.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication273-abstract.html">
			Details <span class="sr-only" > about <em> The Complexity of Nested Counterfactuals and Iterated Knowledge Base Revisions  </em></span> </a> |
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	<p class="publicationTitle"> <strong>
            The Power of Beliefs or Translating Default Logic into Standard Autoepistemic Logic </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            IJCAI</em>.
        
                Pages 570&#x2212;577.
            1993.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Curb Your Theory! A Circumspective Approach for Inclusive Interpretation of Disjunctive Information </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter&#x201a; Georg Gottlob and Yuri Gurevich  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            IJCAI</em>.
        
                Pages 634&#x2212;639.
            1993.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Complexity Results for Disjunctive Logic Programming and Application to Nonmonotonic Logics </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            ILPS</em>.
        
                Pages 266&#x2212;278.
            1993.
        </p>
	
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            		href="/publications/publication276-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Recent Complexity Results in Logic Programming and Nonmonotonic Reasoning&#x201a; and Why They Matter (Invited Talk Abstract) </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            LPNMR</em>.
        
                Pages 265.
            1993.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication277-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Complexity Aspects of Various Semantics for Disjunctive Databases </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the Twelfth ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; May 25&#x2212;28&#x201a; 1993&#x201a; Washington&#x201a; DC</em>.
        
                Pages 158&#x2212;167.
            ACM Press.
        1993.
        </p>
	
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			 | <a
		href="http://dx.doi.org/10.1145/153850.153864">
		DOI (10.1145/153850.153864)
		</a> 
					| <a href="http://www.informatik.uni-trier.de/~ley/db/conf/pods/EiterG93.html"> Link <span class="sr-only" > to <em> Complexity Aspects of Various Semantics for Disjunctive Databases  </em></span> </a>
  				
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            The Complexity of Logic&#x2212;Based Abduction </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Patrice Enjalbert&#x201a; Alain Finkel and Klaus W. Wagner, editors,
             
            <em>
            STACS 93&#x201a; 10th Annual Symposium on Theoretical Aspects of Computer Science&#x201a; W&#xfc;rzburg&#x201a; Germany&#x201a; February 25&#x2212;27&#x201a; 1993&#x201a; Proceedings</em>.
        
            Vol. 665
                of Lecture Notes in Computer Science.
        
                Pages 70&#x2212;79.
            Springer.
        1993.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Computational Logic and Proof Theory&#x201a; Third Kurt G&#xf6;del Colloquium&#x201a; KGC'93&#x201a; Brno&#x201a; Czech Republic&#x201a; August 24&#x2212;27&#x201a; 1993&#x201a; Proceedings </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Alexander Leitsch and Daniele Mundici, editors  </em> </p>
	
	<p class="publicationDetails"> </p>
	
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            		href="/publications/publication271-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            An Efficient Method for Eliminating Varying Predicates from a Circumscription </strong> </p>
	    <p class="publicationAuthors"> <em> Marco Cadoli&#x201a; Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Artif. Intell.</em>.
        
            Vol. 54.
        
            No. 2.
        
                Pages 397&#x2212;410.
            1992.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            On the Complexity of Propositional Knowledge Base Revision&#x201a; Updates&#x201a; and Counterfactuals </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Artif. Intell.</em>.
        
            Vol. 57.
        
            No. 2&#x2212;3.
        
                Pages 227&#x2212;270.
            1992.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Selective Inheritance of Attribute Values in Relational Databases </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Michael Schrefl and Markus Stumptner  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Discrete Applied Mathematics</em>.
        
            Vol. 40.
        
            No. 2.
        
                Pages 187&#x2212;216.
            1992.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Reasoning with parsimonious and moderately grounded expansions </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Fundam. Inform.</em>.
        
            Vol. 17.
        
            No. 1&#x2212;2.
        
                Pages 31&#x2212;53.
            1992.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Complexity Results for Nonmonotonic Logics </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Log. Comput.</em>.
        
            Vol. 2.
        
            No. 3.
        
                Pages 397&#x2212;425.
            1992.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Complexity of Propositional Knowledge Base Revision </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In G&#xe9;rard Comyn&#x201a; Matthias Jarke and Suryanarayana M. Sripada, editors,
             
            <em>
            CNKBS'92&#x201a; Proceedings of the First Compulog Net Meeting on Knowledge Bases&#x201a; Munich&#x201a; Germany&#x201a; 6&#x2212;7 February 1992</em>.
        
            Vol. ECRC&#x2212;92&#x2212;2.
        
                Pages 38&#x2212;40.
            European Computer&#x2212;Industry Research Centre&#x201a; Munich.
        1992.
        </p>
	
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            		href="/publications/publication283-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Formaiizing the Repair Process </strong> </p>
	    <p class="publicationAuthors"> <em> Gerhard Friedrich&#x201a; Georg Gottlob and Wolfgang Nejdl  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            ECAI</em>.
        
                Pages 709&#x2212;713.
            1992.
        </p>
	
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            		href="/publications/publication284-abstract.html">
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	<p class="publicationTitle"> <strong>
            On the Complexity of Propositional Knowledge Base Revision&#x201a; Updates&#x201a; and Counterfactuals </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the Eleventh ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; June 2&#x2212;4&#x201a; 1992&#x201a; San Diego&#x201a; California</em>.
        
                Pages 261&#x2212;273.
            ACM Press.
        1992.
        </p>
	
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            		href="/publications/publication286-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1145/137097.137886">
		DOI (10.1145/137097.137886)
		</a> 
					| <a href="http://www.informatik.uni-trier.de/~ley/db/conf/pods/EiterG92.html"> Link <span class="sr-only" > to <em> On the Complexity of Propositional Knowledge Base Revision&#x201a; Updates&#x201a; and Counterfactuals  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Complexity Results for Logic&#x2212;Based Abduction </strong> </p>
	    <p class="publicationAuthors"> <em> Thomas Eiter and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Structural Complexity and Recursion&#x2212;theoretic methods in Logic&#x2212;Programming</em>.
        
                Pages 29&#x2212;44.
            1992.
        </p>
	
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            		href="/publications/publication287-abstract.html">
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	<p class="publicationTitle"> <strong>
            Advances in Database Technology &#x2212; EDBT'92&#x201a; 3rd International Conference on Extending Database Technology&#x201a; Vienna&#x201a; Austria&#x201a; March 23&#x2212;27&#x201a; 1992&#x201a; Proceedings </strong> </p>
	    <p class="publicationAuthors"> <em> Alain Pirotte&#x201a; Claude Delobel and Georg Gottlob, editors  </em> </p>
	
	<p class="publicationDetails"> </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication282-abstract.html">
			Details <span class="sr-only" > about <em> Advances in Database Technology &#x2212; EDBT'92&#x201a; 3rd International Conference on Extending Database Technology&#x201a; Vienna&#x201a; Austria&#x201a; March 23&#x2212;27&#x201a; 1992&#x201a; Proceedings  </em></span> </a> |
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		>
			
	
	<p class="publicationTitle"> <strong>
            On the Complexity of Clause Condensing </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In Hermann Kaindl, editor,
             
            <em>
            Proc. 7th Austrian Conference on Artificial Intelligence&#x201a; &#xd6;GAI&#x2212;91&#x201a; Wien&#x201a; 24.&#x2212;27. September 1991</em>.
        
            Vol. 287
                of Informatik&#x2212;Fachberichte.
        
                Pages 16&#x2212;29.
            Springer.
        1991.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Towards a Theory of the Repair Process </strong> </p>
	    <p class="publicationAuthors"> <em> Gerhard Friedrich&#x201a; Georg Gottlob and Wolfgang Nejdl  </em> </p>
	
	<p class="publicationDetails"> 
            In Pedro Barahona&#x201a; Lu&#xed;s Moniz Pereira and Ant&#xf3;nio Porto, editors,
             
            <em>
            EPIA 91&#x201a; 5th Portuguese Conference on Artificial Intelligence&#x201a; Albufeira&#x201a; Portugal&#x201a; October 1&#x2212;3&#x201a; 1991&#x201a; Proceedings</em>.
        
            Vol. 541
                of Lecture Notes in Computer Science.
        
                Pages 222&#x2212;236.
            Springer.
        1991.
        </p>
	
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            		href="/publications/publication294-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Logic Programming and Databases </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri&#x201a; Georg Gottlob and Letizia Tanca  </em> </p>
	
	<p class="publicationDetails"> Springer.
        1990.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication296-abstract.html">
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				[224] 
			</div>

		
        
		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Investigation on Armstrong relations&#x201a; dependency inference&#x201a; and excluded functional dependencies </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Leonid Libkin  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Acta Cybern.</em>.
        
            Vol. 9.
        
            No. 4.
        
                Pages 385&#x2212;402.
            1990.
        </p>
	
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				[225] 
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		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Physical Impossibility Instead of Fault Models </strong> </p>
	    <p class="publicationAuthors"> <em> Gerhard Friedrich&#x201a; Georg Gottlob and Wolfgang Nejdl  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            AAAI</em>.
        
                Pages 331&#x2212;336.
            1990.
        </p>
	
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            		href="/publications/publication297-abstract.html">
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				[226] 
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		>
			
	
	<p class="publicationTitle"> <strong>
            Semantics of Object&#x2212;Oriented Data Models &#x2212; The Evolving Algebra Approach </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Gerti Kappel and Michael Schrefl  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            East/West Database Workshop</em>.
        
                Pages 144&#x2212;160.
            1990.
        </p>
	
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				[227] 
			</div>

		
        
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Hypothesis Classification&#x201a; Abductive Diagnosis and Therapy </strong> </p>
	    <p class="publicationAuthors"> <em> Gerhard Friedrich&#x201a; Georg Gottlob and Wolfgang Nejdl  </em> </p>
	
	<p class="publicationDetails"> 
            In Georg Gottlob and Wolfgang Nejdl, editors,
             
            <em>
            Expert Systems in Engineering&#x201a; Principles and Applications&#x201a; International Workshop&#x201a; Vienna&#x201a; Austria&#x201a; September 24&#x2212;26&#x201a; 1990&#x201a; Proceedings</em>.
        
            Vol. 462
                of Lecture Notes in Computer Science.
        
                Pages 69&#x2212;78.
            Springer.
        1990.
        </p>
	
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			</div>

		
        
		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Expert Systems in Engineering&#x201a; Principles and Applications&#x201a; International Workshop&#x201a; Vienna&#x201a; Austria&#x201a; September 24&#x2212;26&#x201a; 1990&#x201a; Proceedings </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Wolfgang Nejdl, editors  </em> </p>
	
	<p class="publicationDetails"> </p>
	
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				[229] 
			</div>

		
        
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		>
			
	
	<p class="publicationTitle"> <strong>
            What you Always Wanted to Know About Datalog (And Never Dared to Ask) </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri&#x201a; Georg Gottlob and Letizia Tanca  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>IEEE Trans. Knowl. Data Eng.</em>.
        
            Vol. 1.
        
            No. 1.
        
                Pages 146&#x2212;166.
            1989.
        </p>
	
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				[230] 
			</div>

		
        
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		>
			
	
	<p class="publicationTitle"> <strong>
            Efficient Database Access from Prolog </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri&#x201a; Georg Gottlob and Gio Wiederhold  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>IEEE Trans. Software Eng.</em>.
        
            Vol. 15.
        
            No. 2.
        
                Pages 153&#x2212;164.
            1989.
        </p>
	
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	</div> 
	
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				[231] 
			</div>

		
        
		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Magic Semi&#x2212;Joins </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri&#x201a; Georg Gottlob&#x201a; Letizia Tanca and Gio Wiederhold  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Inf. Process. Lett.</em>.
        
            Vol. 33.
        
            No. 2.
        
                Pages 97&#x2212;107.
            1989.
        </p>
	
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				[232] 
			</div>

		
        
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		>
			
	
	<p class="publicationTitle"> <strong>
            On the Interaction between Transitive Closure and Functional Dependencies </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Michael Schrefl and Markus Stumptner  </em> </p>
	
	<p class="publicationDetails"> 
            In J&#xe1;nos Demetrovics and Bernhard Thalheim, editors,
             
            <em>
            MFDBS 89&#x201a; 2nd Symposium on Mathematical Fundamentals of Database Systems&#x201a; Visegr&#xe1;d&#x201a; Hungary&#x201a; June 26&#x2212;30&#x201a; 1989</em>.
        
            Vol. 364
                of Lecture Notes in Computer Science.
        
                Pages 187&#x2212;206.
            Springer.
        1989.
        </p>
	
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				[233] 
			</div>

		
        
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		>
			
	
	<p class="publicationTitle"> <strong>
            Properties and Update Semantics of Consistent Views </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob&#x201a; Paolo Paolini and Roberto Zicari  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>ACM Trans. Database Syst.</em>.
        
            Vol. 13.
        
            No. 4.
        
                Pages 486&#x2212;524.
            1988.
        </p>
	
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			 | <a
		href="http://dx.doi.org/10.1145/49346.50068">
		DOI (10.1145/49346.50068)
		</a> 
					| <a href="http://www.informatik.uni-trier.de/~ley/db/journals/tods/GottlobPZ88.html"> Link <span class="sr-only" > to <em> Properties and Update Semantics of Consistent Views  </em></span> </a>
  				
		
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				[234] 
			</div>

		
        
		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            The Algres Project </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri&#x201a; Stefano Crespi&#x2212;Reghizzi&#x201a; Georg Gottlob&#x201a; F. Lamperti&#x201a; Luigi Lavazza&#x201a; Letizia Tanca and Roberto Zicari  </em> </p>
	
	<p class="publicationDetails"> 
            In Joachim W. Schmidt&#x201a; Stefano Ceri and Michele Missikoff, editors,
             
            <em>
            Advances in Database Technology &#x2212; EDBT'88&#x201a; Proceedings of the International Conference on Extending Database Technology&#x201a; Venice&#x201a; Italy&#x201a; March 14&#x2212;18&#x201a; 1988</em>.
        
            Vol. 303
                of Lecture Notes in Computer Science.
        
                Pages 551&#x2212;555.
            Springer.
        1988.
        </p>
	
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				[235] 
			</div>

		
        
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		>
			
	
	<p class="publicationTitle"> <strong>
            Closed World Databases Opened Through Null Values </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Roberto Zicari  </em> </p>
	
	<p class="publicationDetails"> 
            In Fran&#xe7;ois Bancilhon and David J. DeWitt, editors,
             
            <em>
            Fourteenth International Conference on Very Large Data Bases&#x201a; August 29 &#x2212; September 1&#x201a; 1988&#x201a; Los Angeles&#x201a; California&#x201a; USA&#x201a; Proceedings</em>.
        
                Pages 50&#x2212;61.
            Morgan Kaufmann.
        1988.
        </p>
	
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				[236] 
			</div>

		
        
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Subsumption and Implication </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Inf. Process. Lett.</em>.
        
            Vol. 24.
        
            No. 2.
        
                Pages 109&#x2212;111.
            1987.
        </p>
	
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            		href="/publications/publication309-abstract.html">
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				[237] 
			</div>

		
        
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            On the Size of Nonredundant FD&#x2212;Covers </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Inf. Process. Lett.</em>.
        
            Vol. 24.
        
            No. 6.
        
                Pages 355&#x2212;360.
            1987.
        </p>
	
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				[238] 
			</div>

		
        
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Computing Covers for Embedded Functional Dependencies </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the Sixth ACM SIGACT&#x2212;SIGMOD&#x2212;SIGART Symposium on Principles of Database Systems&#x201a; March 23&#x2212;25&#x201a; 1987&#x201a; San Diego&#x201a; California</em>.
        
                Pages 58&#x2212;69.
            ACM.
        1987.
        </p>
	
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            		href="/publications/publication308-abstract.html">
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			 | <a
		href="http://dx.doi.org/10.1145/28659.28665">
		DOI (10.1145/28659.28665)
		</a> 
					| <a href="http://www.informatik.uni-trier.de/~ley/db/conf/pods/Gottlob87.html"> Link <span class="sr-only" > to <em> Computing Covers for Embedded Functional Dependencies  </em></span> </a>
  				
		
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				[239] 
			</div>

		
        
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Normalization of Relations and PROLOG </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Commun. ACM</em>.
        
            Vol. 29.
        
            No. 6.
        
                Pages 524&#x2212;544.
            1986.
        </p>
	
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            		href="/publications/publication313-abstract.html">
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				[240] 
			</div>

		
        
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Taxonomy and formal properties of distributed joins </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri&#x201a; Georg Gottlob and Giuseppe Pelagatti  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Inf. Syst.</em>.
        
            Vol. 11.
        
            No. 1.
        
                Pages 25&#x2212;40.
            1986.
        </p>
	
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				[241] 
			</div>

		
        
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Optimizing Joins between Two Partitioned Relations in Distributed Databases </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. Parallel Distrib. Comput.</em>.
        
            Vol. 3.
        
            No. 2.
        
                Pages 183&#x2212;205.
            1986.
        </p>
	
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            		href="/publications/publication315-abstract.html">
			Details <span class="sr-only" > about <em> Optimizing Joins between Two Partitioned Relations in Distributed Databases  </em></span> </a> |
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		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Interfacing Relational Databases and Prolog Efficiently </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri&#x201a; Georg Gottlob and Gio Wiederhold  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Expert Database Conf.</em>.
        
                Pages 207&#x2212;223.
            1986.
        </p>
	
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		<div
			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Translation and Optimization of Logic Queries: The Algebraic Approach </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri&#x201a; Georg Gottlob and Luigi Lavazza  </em> </p>
	
	<p class="publicationDetails"> 
            In Wesley W. Chu&#x201a; Georges Gardarin&#x201a; Setsuo Ohsuga and Yahiko Kambayashi, editors,
             
            <em>
            VLDB'86 Twelfth International Conference on Very Large Data Bases&#x201a; August 25&#x2212;28&#x201a; 1986&#x201a; Kyoto&#x201a; Japan&#x201a; Proceedings</em>.
        
                Pages 395&#x2212;402.
            Morgan Kaufmann.
        1986.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Translating SQL Into Relational Algebra: Optimization&#x201a; Semantics&#x201a; and Equivalence of SQL Queries </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>IEEE Trans. Software Eng.</em>.
        
            Vol. 11.
        
            No. 4.
        
                Pages 324&#x2212;345.
            1985.
        </p>
	
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            On the Efficiency of Subsumption Algorithms </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Alexander Leitsch  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>J. ACM</em>.
        
            Vol. 32.
        
            No. 2.
        
                Pages 280&#x2212;295.
            1985.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Fast Subsumption Algorithms </strong> </p>
	    <p class="publicationAuthors"> <em> Georg Gottlob and Alexander Leitsch  </em> </p>
	
	<p class="publicationDetails"> 
            In B. F. Caviness, editor,
             
            <em>
            EUROCAL '85&#x201a; European Conference on Computer Algebra&#x201a; Linz&#x201a; Austria&#x201a; April 1&#x2212;3&#x201a; 1985&#x201a; Proceedings Volume 2: Research Contributions</em>.
        
            Vol. 204
                of Lecture Notes in Computer Science.
        
                Pages 64&#x2212;77.
            Springer.
        1985.
        </p>
	
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			class="col-xs-11"
		>
			
	
	<p class="publicationTitle"> <strong>
            Implementation of a Distributed File System on a Geographic Network of Personal Computers </strong> </p>
	    <p class="publicationAuthors"> <em> S. Copelli and Georg Gottlob  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            DDSS</em>.
        
                Pages 203&#x2212;219.
            1984.
        </p>
	
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		>
			
	
	<p class="publicationTitle"> <strong>
            Joining Fragmented Relations in Distributed Databases </strong> </p>
	    <p class="publicationAuthors"> <em> Stefano Ceri&#x201a; Georg Gottlob and Giuseppe Pelagatti  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            XP4.5 Workshop on Database Theory&#x201a; 1983 Palo Alto&#x201a; California&#x201a; USA</em>.
        1983.
        </p>
	
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