@inproceedings{ILPS-1993-GrecoSZ,
	author        = "Sergio Greco and Domenico Saccà and Carlo Zaniolo",
	booktitle     = "{Proceedings of the International Symposium on Logic Programming}",
	isbn          = "0-262-63152-0",
	pages         = "575--589",
	publisher     = "{MIT Press}",
	title         = "{Dynamic Programming Optimization for Logic Queries with Aggregates}",
	year          = 1993,
}