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What to ask to a peer: Ontology-based query reformulation, , , , and . Proc. of the 9th Int. Conf. on the Principles of Knowledge Representation and Reasoning (KR 2004), (2004)A Formal Framework for Reasoning on UML Class Diagrams, , , and . ISMIS '02: Proceedings of the 13th International Symposium on Foundations of Intelligent Systems, page 503--513. London, UK, Springer-Verlag, (2002)Fundamentals of Data Warehouses, , , and . Springer Verlag, (2003)Rewriting of Regular Path Queries., , , and . SEBD, page 213-224. (1999)Description Logics for Databases., , and . Description Logic Handbook, Cambridge University Press, (2003)Adding Epistemic Operators to Concept Languages., , , , and . KR, page 342-353. Morgan Kaufmann, (1992)Preface.. Theor. Comput. Sci., 336 (1): 1- (2005)View-based query processing: On the relationship between rewriting, answering and losslessness., , , and . Theor. Comput. Sci., 371 (3): 169-182 (2007)View-based query answering in Description Logics: Semantics and complexity., , , and . J. Comput. Syst. Sci., 78 (1): 26-46 (2012)Deductive Entity-Relationship Modeling., and . IEEE Trans. Knowl. Data Eng., 5 (3): 439-450 (1993)