@inproceedings{RE-2009-RegevHGW,
	author        = "Gil Regev and Olivier Hayard and Donald C. Gause and Alain Wegmann",
	booktitle     = "{Proceedings of the 17th International Requirements Engineering Conference}",
	doi           = "10.1109/RE.2009.39",
	isbn          = "978-0-7695-3761-0",
	pages         = "231--236",
	publisher     = "{IEEE Computer Society}",
	title         = "{Modeling Service-Level Requirements: A Constancy Perspective}",
	year          = 2009,
}