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Calì, Andrea and Gottlob, G. and Pieris, A. (2012) Towards more expressive ontology languages: the query answering problem. Artificial Intelligence 193 , pp. 87-128. ISSN 0004-3702.

Calì, Andrea and Gottlob, G. and Pieris, A. (2012) Ontological query answering under expressive entity-relationship schemata. Information Systems 37 (4), pp. 320-335. ISSN 0306-4379.

Calì, Andrea and Gottlob, G. and Lukasiewicz, T. and Pieris, A. (2011) A logical toolbox for ontological reasoning. ACM SIGMOD Record 40 (3), pp. 5-14. ISSN 0163-5808.

Calì, Andrea and Gottlob, G. and Pieris, A. (2010) Query rewriting under non-guarded rules. Proceedings of the 4th Alberto Mendelzon International Workshop on Foundations of Data Management 619 , ISSN 1613-0073.

Book Section

Calì, Andrea and Gottlob, G. and Orsi, G. and Pieris, A. (2012) On the interaction of existential rules and equality constraints in ontology querying. In: Erdem, E. and Lee, J. and Lierler, Y. and Pearce, D. (eds.) Correct Reasoning: Essays on Logic-Based AI in Honour of Vladimir Lifschitz. Lecture Notes in Computer Science 7265. Berlin, Germany: Springer, pp. 117-133. ISBN 9783642307423.

Calì, Andrea and Gottlob, G. and Orsi, G. and Pieris, A. (2012) Querying UML class diagrams. In: Birkedal, L. (ed.) Foundations of Software Science and Computational Structures. Lecture Notes in Computer Science 7213. Berlin, Germany: Springer, pp. 1-25. ISBN 9783642287282.

Calì, Andrea and Gottlob, G. and Lukasiewicz, T. and Pieris, A. (2011) Datalog+/-: a family of languages for ontology querying. In: de Moor, O. and Gottlob, G. and Furche, T. and Sellers, A. (eds.) Datalog Reloaded. Lecture Notes in Computer Science 6702. London, UK: Springer, pp. 351-368. ISBN 9783642242069.

Calì, Andrea and Gottlob, G. and Pieris, A. (2011) New expressive languages for ontological query answering. In: Burgard, W. and Roth, D. (eds.) Proceedings of the Twenty-Fifth AAAI Conference on Artificial Intelligence, AAAI 2011, San Francisco, California, USA, August 7-11, 2011. California, U.S.: AAAI Press, pp. 1541-1546. ISBN 9781577355076.

Calì, Andrea and Pieris, A. (2011) On equality-generating dependencies in ontology querying - preliminary report. In: Barcelo, P. and Tannen, V. (eds.) Proceedings of the 5th Alberto Mendelzon International Workshop on Foundations of Data Management, Santiago, Chile, May 9-12, 2011. CEUR Workshop Proceedings 749. CEUR Workshop Proceedings.

Calì, Andrea and Gottlob, G. and Pieris, A. (2011) Querying conceptual schemata with expressive equality constraints. In: Jeusfeld, M. and Delcambre, L. and Ling, T.-W. (eds.) Conceptual Modeling: ER 2011. Lecture Notes in Computer Science 6998. Berlin, Germany: Springer, pp. 161-174. ISBN 9783642246050.

Calì, Andrea and Gottlob, G. and Kifer, M. and Lukasiewicz, T. and Pieris, A. (2010) Ontological reasoning with F-Logic Lite and its extensions. In: UNSPECIFIED (ed.) Proceedings of the Twenty-Fourth AAAI Conference on Artificial Intelligence. AAAI 10. Palo Alto, California, USA: AAAI Publications, pp. 1660-1665. ISBN 9781577354635.

Calì, Andrea and Gottlob, G. and Pieris, A. (2010) Advanced processing for ontological queries. In: UNSPECIFIED (ed.) 36th International Conference on Very Large Data Bases 2010 (VLDB 2010), Singapore, 13-17 September 2010. Proceedings of the VLDB Endowment 3. New York, U.S.: Association for Computing Machinery, pp. 554-565. ISBN 9781617820373.

Calì, Andrea and Gottlob, G. and Lukasiewicz, T. and Marnette, B. and Pieris, A. (2010) Datalog+/-: a family of logical knowledge representation and query languages for new applications. In: UNSPECIFIED (ed.) 25th Annual IEEE Symposium on Logic in Computer Science. Washington, USA: IEEE Computer Society, pp. 228-242. ISBN 9780769541143.

Calì, Andrea and Gottlob, G. and Pieris, A. (2010) Query answering under expressive entity-relationship schemata. In: Parsons, J. and Woo, C. and Saeki, M. and Shoval, P. and Wand, Y. (eds.) Conceptual Modeling. Lecture Notes in Computer Science 6412 6412. London, UK: Springer, pp. 347-361. ISBN 9783642163739.

Calì, Andrea and Gottlob, G. and Pieris, A. (2010) Query answering under non-guarded rules in datalog+/-. In: Pascal, H. and Thomas, L. (eds.) Web Reasoning and Rule. Systems Lecture Notes in Computer Science 6333. Berlin, Germany: Springer, pp. 1-17. ISBN 978-3-642-15917-6.

Calì, Andrea and Gottlob, G. and Pieris, A. (2010) Tractable query answering over conceptual schemata (extended abstract). In: Bergamaschi, S. and Lodi, S. and Martoglia, R. and Sartori, C. (eds.) Proceedings of the Eighteenth Italian Symposium on Advanced Database Systems, SEBD 2008, 22-25 June 2008, Mondello, PA, Italy. Bologna, Italy: Esculapio Editore, pp. 454-461. ISBN 9788874883691.

Calì, Andrea and Gottlob, G. and Pieris, A. (2009) Tractable query answering over conceptual schemata. In: Laender, A.H.F. and Castano, S. and Dayal, U. and Casati, F. and Oliverira, J.P.M. (eds.) 28th International Conference on Conceptual Modeling. Lecture Notes in Computer Science 5829. Berlin, Germany: Springer, pp. 175-190. ISBN 9783642048401.