@inproceedings{KR-1989-Pearl,
	author        = "Judea Pearl",
	booktitle     = "{Proceedings of the First International Conference on Principles of Knowledge Representation and Reasoning}",
	isbn          = "1-55860-032-9",
	pages         = "505--516",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Probabilistic Semantics for Nonmonotonic Reasoning: A Survey}",
	year          = 1989,
}