@inproceedings{CAiSE-1989-Nilsson,
	author        = "Anders G. Nilsson",
	booktitle     = "{Proceedings of the First Nordic Conference on Advanced Systems Engineering, CA(i)SE (republished at CEUR-WS.org in 2013)}",
	ee            = "http://ceur-ws.org/Vol-961/paper4.pdf",
	publisher     = "{CEUR-WS.org}",
	series        = "{CEUR Workshop Proceedings}",
	title         = "{Information Systems Development: A Frame Of Reference and Classifications}",
	volume        = 961,
	year          = 1989,
}