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Kontchakov, Roman and Ryzhikov, Vladislav and Zakharyaschev, Michael (2013) Conjunctive query inseparability in OWL2QL is ExpTime-hard. In: Eiter, T. and Glimm, B. and Kazakov, Y. and Krötzsch, M. (eds.) Informal Proceedings of DL (Ulm, 23-26 July). CEUR Workshop Proceedings 1014. CEUR-WS, pp. 353-363.
Kikot, Stanislav and Kontchakov, Roman and Podolskii, V. and Zakharyaschev, Michael (2013) Query rewriting over shallow ontologies. In: Eiter, T. and Glimm, B. and Kazakov, Y. and Krötzsch, M. (eds.) Informal Proceedings of DL (Ulm, 23-26 July). CEUR Workshop Proceedings 1014. CEUR-WS, pp. 316-327.
Artale, A. and Kontchakov, Roman and Wolter, F. and Zakharyaschev, Michael (2013) Temporalising OWL 2 QL. In: Eiter, T. and Glimm, B. and Kazakov, Y. and Krötzsch, M. (eds.) Informal Proceedings of DL (Ulm, 23-26 July). CEUR Workshop Proceedings 1014. CEUR-WS, pp. 17-28.