@inproceedings{KR-1992-Ryan,
	author        = "Mark Ryan",
	booktitle     = "{Proceedings of the Third International Conference on Principles of Knowledge Representation and Reasoning}",
	isbn          = "1-55860-262-3",
	pages         = "649--660",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Representing Defaults as Sentences with Reduced Priority}",
	year          = 1992,
}