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@inproceedings{SEBD-2004, title = "Query Reformulation over Ontology-based Peers", year = "2004", author = "Diego Calvanese and De Giacomo, Giuseppe and Domenico Lembo and Maurizio Lenzerini and Riccardo Rosati", booktitle = "Proc. of the 12th Italian Symp. on Advanced Database Systems (SEBD 2004)", pages = "418--425", }pdf