Book Section

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.

Hurtado, C.A. and Poulovassilis, Alexandra and Wood, Peter T. (2009) Ranking approximate answers to semantic web queries. In: Aroyo, L. and Traverso, P. and Ciravegna, F. and Cimiano, P. and Heath, T. and Hyvonen, E. and Mizoguchi, R. and Oren, E. and Sabou, M. and Simperl, E. (eds.) The Semantic Web: Research and Applications. Lecture Notes In Computer Science 5554. Berlin, Germany: Springer, pp. 263-277. ISBN 9783642021206.