@inproceedings{UML-2003-AlanenP,
	author        = "Marcus Alanen and Ivan Porres",
	booktitle     = "{Proceedings of the Sixth International Conference on the Unified Modeling Language, Modeling Languages and Applications}",
	doi           = "10.1007/978-3-540-45221-8_2",
	editor        = "Perdita Stevens and Jon Whittle and Grady Booch",
	isbn          = "3-540-20243-9",
	pages         = "2--17",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Difference and Union of Models}",
	volume        = 2863,
	year          = 2003,
}