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@inproceedings{SEBD-2003, title = "Query Containment Using Views", year = "2003", author = "Diego Calvanese and De Giacomo, Giuseppe and Maurizio Lenzerini and Moshe Y. Vardi", booktitle = "Proc. of the 11th Italian Symp. on Advanced Database Systems (SEBD 2003)", pages = "467--474", }