@inproceedings{ICLP-1987-SaccaZ87,
	author        = "Domenico Saccà and Carlo Zaniolo",
	booktitle     = "{Proceedings of the Fourth International Conference on Logic Programming, 2 Volumes}",
	isbn          = "0-262-12125-5",
	pages         = "104--135",
	publisher     = "{MIT Press}",
	title         = "{Implementation of Recursive Queries for a Data Language Based on Pure Horn Logic}",
	year          = 1987,
}