@inproceedings{VDME-1990-SampaioM,
	author        = "Augusto Sampaio and Silvio Romero de Lemos Meira",
	booktitle     = "{Proceedings of the Third International Symposium on Vienna Development Method and Z: Formal Methods in Software Development}",
	doi           = "10.1007/3-540-52513-0_12",
	isbn          = "3-540-52513-0",
	pages         = "211--232",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Modular Extensions to Z}",
	volume        = 428,
	year          = 1990,
}