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Xiao, G. and Lanti, D. and Kontchakov, Roman and Komla-Ebri, S. and Güzel-Kalaycı, E. and Ding, L. and Corman, J. and Cogrel, B. and Calvanese, D. and Botoeva, E. (2020) The virtual knowledge graph system Ontop. In: Pan, J.Z. and Tamma, V. and d’Amato, C. and Janowicz, K. and Fu, B. and Polleres, A. and Seneviratne, O. and Kagal, L. (eds.) The Semantic Web - ISWC 2020 - 19th International Semantic Web Conference, Part II. Lecture Notes in Computer Science 12507. Springer, pp. 259-277.

Kalayci, E. and Brandt, S. and Calvanese, D. and Ryzhikov, Vladislav and Xiao, G. and Zakharyaschev, Michael (2019) Ontology-based access to temporal data with Ontop: a framework proposal. International Journal of Applied Mathematics and Computer Science 29 (1), pp. 17-30. ISSN 2083-8492.

Brandt, S. and Calvanese, D. and Güzel Kalayci, E. and Kontchakov, Roman and Mörzinger, B. and Ryzhikov, Vladislav and Xiao, G. and Zakharyaschev, Michael (2019) Two-dimensional rule language for querying sensor log data: a framework and use cases. In: Gamper, J. and Pinchinat, S. and Sciavicco, G. (eds.) 26th International Symposium on Temporal Representation and Reasoning (TIME 2019). Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik, pp. 1-15. ISBN 9783959771276.

Xiao, G. and Kontchakov, Roman and Cogrel, B. and Calvanese, D. and Botoeva, E. (2018) Efficient handling of SPARQL OPTIONAL for OBDA. In: Vrandečić, D. and Bontcheva, K. and Suárez-Figueroa, M.C. and Presutti, V. and Celino, I. and Sabou, M. and Kaffee, L.-A. and Simperl, E. (eds.) The Semantic Web – ISWC 2018 17th International Semantic Web Conference, Monterey, CA, USA, October 8–12, 2018, Proceedings, Part I. Lecture Notes in Computer Science 11136. Springer, pp. 354-373. ISBN 9783030006716.

Brandt, S. and Güzel Kalaycı, E. and Ryzhikov, Vladislav and Xiao, G. and Zakharyaschev, Michael (2018) Querying log data with Metric Temporal Logic. Artificial Intelligence Research 62 , pp. 829-877. ISSN 1927-6974.

Xiao, G. and Calvanese, D. and Kontchakov, Roman and Lembo, D. and Poggi, A. and Rosati, R. and Zakharyaschev, Michael (2018) Ontology-based data access: a survey. In: UNSPECIFIED (ed.) Proceedings of the Twenty-Seventh International Joint Conference on Artificial Intelligence. International Joint Conferences on Artificial Intelligence, pp. 5511-5519. ISBN 9780999241127.

Brandt, S. and Güzel Kalaycı, E. and Kontchakov, Roman and Ryzhikov, Vladislav and Xiao, G. and Zakharyaschev, Michael (2017) Ontology-based data access with a horn fragment of metric temporal logic. In: UNSPECIFIED (ed.) Proceedings of the Thirty-First AAAI Conference on Artificial Intelligence (AAAI 2017). AAAI Press, pp. 1070-1076.

Calvanese, D. and Cogrel, B. and Komla-Ebri, S. and Kontchakov, Roman and Lanti, D. and Rezk, M. and Rodriguez-Muro, M. and Xiao, G. (2016) Ontop: answering SPARQL queries over relational databases. Semantic Web – Interoperability, Usability, Applicability 8 (3), pp. 471-487. ISSN 1570-0844.

Kontchakov, Roman and Rezk, M. and Rodríguez-Muro, M. and Xiao, G. and Zakharyaschev, Michael (2014) Answering SPARQL queries over databases under OWL 2 QL entailment regime. In: Mika, P. and Tudorache, T. and Bernstein, A. and Welty, C. and Knoblock, C. and Vrandečić, D. and Groth, P. and Noy, N. and Janowicz, K. and Goble, C. (eds.) The Semantic Web – ISWC 2014. Lecture Notes in Computer Science 8796. Berlin, Germany: Springer, pp. 552-567. ISBN 9783319119632.