@inproceedings{VLDB-1981-VelosoCF,
	author        = "Paulo A. S. Veloso and José Mauro Volkmer de Castilho and Antonio L. Furtado",
	booktitle     = "{Proceedings of the Seventh International Conference on Very Large Data Bases}",
	cdrom         = "VLDB81/P409.PDF",
	pages         = "409--421",
	publisher     = "{IEEE Computer Society}",
	title         = "{Systematic Derivation of Complementary Specifications}",
	year          = 1981,
}