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Calì, Andrea and Gottlob, G. and Pieris, A. (2011) Querying conceptual schemata with expressive equality constraints. In: Jeusfeld, M. and Delcambre, L. and Ling, T.-W. (eds.) Conceptual Modeling: ER 2011. Lecture Notes in Computer Science 6998. Berlin, Germany: Springer, pp. 161-174. ISBN 9783642246050.