@inproceedings{ICLP-1991-Porto,
	author        = "António Porto",
	booktitle     = "{Proceedings of the Eighth International Conference on Logic Programming}",
	isbn          = "0-262-56058-5",
	pages         = "946",
	publisher     = "{MIT Press}",
	title         = "{Logic Programming Environments}",
	year          = 1991,
}