@inproceedings{UML-1998-KleppeWC,
	author        = "Anneke Kleppe and Jos Warmer and Steve Cook",
	booktitle     = "{Selected Papers of the First International Workshop on the Unified Modeling Language: Beyond the Notation}",
	doi           = "10.1007/978-3-540-48480-6_12",
	editor        = "Jean Bézivin and Pierre-Alain Muller",
	isbn          = "3-540-66252-9",
	pages         = "148--161",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Informal Formality? The Object Constraint Language and Its Application in the UML Metamodel}",
	volume        = 1618,
	year          = 1998,
}