@inproceedings{AF-1987-GoguenM,
	author        = "Joseph A. Goguen and José Meseguer",
	booktitle     = "{Proceedings of the Second International Joint Conference on Theory and Practice of Software Development, Volume 2: Advanced Seminar on Foundations of Innovative Software Development}",
	doi           = "10.1007/BFb0014969",
	isbn          = "3-540-17611-X",
	pages         = "1--22",
	publisher     = "{Springer}",
	title         = "{Models and Equality for Logical Programming}",
	year          = 1987,
}