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Calì, Andrea and Gottlob, G. and Pieris, A. (2010) Tractable query answering over conceptual schemata (extended abstract). In: Bergamaschi, S. and Lodi, S. and Martoglia, R. and Sartori, C. (eds.) Proceedings of the Eighteenth Italian Symposium on Advanced Database Systems, SEBD 2008, 22-25 June 2008, Mondello, PA, Italy. Bologna, Italy: Esculapio Editore, pp. 454-461. ISBN 9788874883691.