@inproceedings{FoSSaCS-2012-CaliGOP,
	author        = "Andrea Calì and Georg Gottlob and Giorgio Orsi and Andreas Pieris",
	booktitle     = "{Proceedings of the 15th International Conference on Foundations of Software Science and Computation Structures}",
	doi           = "10.1007/978-3-642-28729-9_1",
	isbn          = "978-3-642-28728-2",
	pages         = "1--25",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Querying UML Class Diagrams}",
	volume        = 7213,
	year          = 2012,
}