@inproceedings{ICLP-1991-PierroMP,
	author        = "Alessandra Di Pierro and Maurizio Martelli and Catuscia Palamidessi",
	booktitle     = "{Proceedings of the Eighth International Conference on Logic Programming}",
	isbn          = "0-262-56058-5",
	pages         = "32--45",
	publisher     = "{MIT Press}",
	title         = "{Negation as Instantitation: A New Rule for the Treatment of Negation in Logic Programming}",
	year          = 1991,
}