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Konev, B. and Kontchakov, Roman and Michel, L. and Schneider, T. and Wolter, F. and Zakharyaschev, Michael (2011) Conjunctive query inseparability of OWL 2 QL TBoxes. In: Burgard, W. and Roth, D. (eds.) Proceedings of the Twenty-Fifth AAAI Conference on Artificial Intelligence. California, U.S.: AAAI Press, pp. 221-226. ISBN 9781577355076.
Calì, Andrea and Gottlob, G. and Pieris, A. (2011) New expressive languages for ontological query answering. In: Burgard, W. and Roth, D. (eds.) Proceedings of the Twenty-Fifth AAAI Conference on Artificial Intelligence, AAAI 2011, San Francisco, California, USA, August 7-11, 2011. California, U.S.: AAAI Press, pp. 1541-1546. ISBN 9781577355076.