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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.

Book Section

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.

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.