@inproceedings{CAiSE-1993-OpdahlS,
	author        = "Andreas L. Opdahl and Guttorm Sindre",
	booktitle     = "{Proceedings of the Fifth Conference on Advanced Information Systems Engineering}",
	doi           = "10.1007/3-540-56777-1_17",
	isbn          = "3-540-56777-1",
	pages         = "309--327",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Concepts for Real-World Modelling}",
	volume        = 685,
	year          = 1993,
}