@inproceedings{FME-1994-MensMS,
	author        = "Tom Mens and Kim Mens and Patrick Steyaert",
	booktitle     = "{Proceedings of the Second International Symposium of Formal Methods Europe: Industrial Benefit of Formal Methods}",
	doi           = "10.1007/3-540-58555-9_103",
	isbn          = "3-540-58555-9",
	pages         = "326--345",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{OPUS: a Formal Approach to Object-Orientation}",
	volume        = 873,
	year          = 1994,
}