@inproceedings{KR-1989-Geffner,
	author        = "Hector Geffner",
	booktitle     = "{Proceedings of the First International Conference on Principles of Knowledge Representation and Reasoning}",
	isbn          = "1-55860-032-9",
	pages         = "137--148",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Default Reasoning, Minimality and Coherence}",
	year          = 1989,
}