@inproceedings{JICSLP-1992-BrogiLMM,
	author        = "Antonio Brogi and Evelina Lamma and Paolo Mancarella and Paola Mello",
	booktitle     = "{Proceedings of the Joint International Ninth Conference and Symposium on Logic Programming}",
	isbn          = "0-262-51064-2",
	pages         = "783--797",
	publisher     = "{MIT Press}",
	title         = "{Normal Logic Programs as Open Positive Programs}",
	year          = 1992,
}