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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.
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.