@inproceedings{CFLP-1987-Bellia,
	author        = "Marco Bellia",
	booktitle     = "{Proceedings of the Second International Joint Conference on Theory and Practice of Software Development, Volume 2: Colloquium on Functional and Logic Programming and Specifications}",
	doi           = "10.1007/BFb0014985",
	isbn          = "3-540-17611-X",
	pages         = "260--275",
	publisher     = "{Springer}",
	title         = "{Retractions: A Functional Paradigm for Logic Programming}",
	year          = 1987,
}