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Calì, Andrea and Kifer, M. (2007) Containment of conjunctive object meta-queries. In: Ceci, M. and Malerba, D. and Tanca, L. (eds.) Proceedings of the Fifteenth Italian Symposium on Advanced Database Systems. Dipartimento di Informatica: Università degli Studi. ISBN 9788890298103.
Artale, A. and Calvanese, D. and Kontchakov, Roman and Zakharyaschev, M. (2007) Query answering in expressive variants of DL-Lite. In: Ceci, M. and Malerba, D. and Tanca, L. (eds.) Proceedings of the Fifteenth Italian Symposium on Advanced Database Systems. Bari : Università degli Studi, Dipartimento di Informatica, pp. 250-257. ISBN 9788890298103.
Calì, Andrea and Martinenghi, D. and Carbotta, D. (2007) Query optimisation for web data sources: minimisation of the number of accesses. In: Ceci, M. and Malerba, D. and Tanca, L. (eds.) Proceedings of the Fifteenth Italian Symposium on Advanced Database Systems. Dipartimento di Informatica: Università degli Studi, pp. 316-323.