@inproceedings{CAAP-1991-AstesianoC,
	author        = "Egidio Astesiano and Maura Cerioli",
	booktitle     = "{Proceedings of the Fourth International Joint Conference on Theory and Practice of Software Development, Volume 1: Colloquium on Trees in Algebra and Programming}",
	doi           = "10.1007/3-540-53982-4_8",
	isbn          = "3-540-53982-4",
	pages         = "121--142",
	publisher     = "{Springer}",
	title         = "{Non-Strict Don't Care Algebras and Specifications}",
	year          = 1991,
}