@inproceedings{ISLP-1991-PereiraAA,
	author        = "Luís Moniz Pereira and Joaquim Nunes Aparício and José Júlio Alferes",
	booktitle     = "{Proceedings of the Eighth International Symposium on Logic Programming}",
	isbn          = "0-262-69147-7",
	pages         = "566--577",
	publisher     = "{MIT Press}",
	title         = "{Counterfactual Reasoning Based on Revising Assumptions}",
	year          = 1991,
}