@inproceedings{JICSLP-1998-GrecoZ,
	author        = "Sergio Greco and Carlo Zaniolo",
	booktitle     = "{Proceedings of the Joint International 15th Conference and Symposium on Logic Programming}",
	isbn          = "0-262-60031-5",
	pages         = "294--309",
	publisher     = "{MIT Press}",
	title         = "{Greedy Algorithms in Datalog with Choice and Negation}",
	year          = 1998,
}