@inproceedings{MODELS-2006-Kosiuczenko,
	author        = "Piotr Kosiuczenko",
	booktitle     = "{Proceedings of the Ninth International Conference on Model Driven Engineering Languages and Systems}",
	doi           = "10.1007/11880240_47",
	editor        = "Oscar Nierstrasz and Jon Whittle and David Harel and Gianna Reggio",
	isbn          = "3-540-45772-0",
	pages         = "676--691",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Specification of Invariability in OCL}",
	volume        = 4199,
	year          = 2006,
}