@inproceedings{ISLP-1991-Ducasse,
	author        = "Mireille Ducassé",
	booktitle     = "{Proceedings of the Eighth International Symposium on Logic Programming}",
	isbn          = "0-262-69147-7",
	pages         = "18--32",
	publisher     = "{MIT Press}",
	title         = "{Abstract Views of Prolog Executions in Opium}",
	year          = 1991,
}