Andrea Calì, Georg Gottlob, Andreas Pieris. Tractable Query Answering over Conceptual Schemata (Extended Abstract). In Sonia Bergamaschi, Stefano Lodi, Riccardo Martoglia, Claudio Sartori, editors, Proceedings of the Eighteenth Italian Symposium on Advanced Database Systems, SEBD 2010, Rimini, Italy, June 20-23, 2010. pages 454-461, Esculapio Editore, 2010.
Abstract is missing.