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@inproceedings{AAAI-2016-obda-beyond-ql, title = {Beyond OWL 2 QL in OBDA: 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 30th AAAI Conf. on Artificial Intelligence (AAAI 2016)}, publisher = {AAAI Press}, pages = {921-928}, webpdf = {https://www.doc.ic.ac.uk/~ebotoeva/papers/bcsssx-AAAI-16.pdf}, posterpdf = {https://www.doc.ic.ac.uk/~ebotoeva/presentations/bcsssx-AAAI-16-poster.pdf} }