@inproceedings{KR-1998-WilliamsA,
	author        = "Mary-Anne Williams and Grigoris Antoniou",
	booktitle     = "{Proceedings of the Sixth International Conference on Principles of Knowledge Representation and Reasoning}",
	pages         = "24--35",
	publisher     = "{Morgan Kaufmann}",
	title         = "{A Strategy for Revising Default Theory Extensions}",
	year          = 1998,
}