@inproceedings{ICLP-1993-PereiraA,
	author        = "Luís Moniz Pereira and José Júlio Alferes",
	booktitle     = "{Proceedings of the 10th International Conference on Logic Programming}",
	isbn          = "0-262-73105-3",
	pages         = "601--615",
	publisher     = "{MIT Press}",
	title         = "{Optative Reasoning with Scenario Semantics}",
	year          = 1993,
}