@inproceedings{TAPSOFT-1993-BertrandDFL,
	author        = "Yves Bertrand and Jean-François Dufourd and Jean Françon and Pascal Lienhardt",
	booktitle     = "{Proceedings of the Fifth International Joint Conference on Theory and Practice of Software Development}",
	doi           = "10.1007/3-540-56610-4_57",
	isbn          = "3-540-56610-4",
	pages         = "75--89",
	publisher     = "{Springer}",
	title         = "{Algebraic Specification and Development in Geometric Modeling}",
	year          = 1993,
}