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@inproceedings{DL-2016-obda-beyond-ql, title = {Virtual OBDA over Expressive Ontologies: Rewritings and Approximations}, year = {2016}, author = {Elena Botoeva and Diego Calvanese and Valerio Santarelli and Domenico Fabio Savo and Alessandro Solimando and Guohui Xiao}, booktitle = {Proc. of the 29th Int. Workshop on Description Logics (DL 2016)}, webpdf = {https://www.doc.ic.ac.uk/~ebotoeva/papers/bcsssx-DL-16.pdf}, }