@inproceedings{TOOLS-EUROPE-1999-WarmerK,
	author        = "Jos Warmer and Anneke Kleppe",
	booktitle     = "{Proceedings of the 29th International Conference on Technology of Object-Oriented Languages and Systems}",
	doi           = "10.1109/TOOLS.1999.10017",
	isbn          = "0-7695-0275-X",
	pages         = "405",
	publisher     = "{IEEE Computer Society}",
	title         = "{Introduction to OCL}",
	year          = 1999,
}