@inproceedings{RE-1993-Ryan,
	author        = "Mark Ryan",
	booktitle     = "{Proceedings of IEEE International Symposium on Requirements Engineering}",
	doi           = "10.1109/ISRE.1993.324823",
	isbn          = "0-8186-3120-1",
	pages         = "142--149",
	publisher     = "{IEEE}",
	title         = "{Defaults in specifications}",
	year          = 1993,
}