@inproceedings{ESEC-1993-BustardW,
	author        = "David W. Bustard and Adam C. Winstanley",
	booktitle     = "{Proceedings of the Fourth European Software Engineering Conference}",
	doi           = "10.1007/3-540-57209-0_9",
	editor        = "Ian Sommerville and Manfred Paul",
	isbn          = "3-540-57209-0",
	pages         = "115--126",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Making Changes to Formal Specifications: Requirements and an Example}",
	volume        = 717,
	year          = 1993,
}