@inproceedings{KR-1998-BrewkaE,
	author        = "Gerhard Brewka and Thomas Eiter",
	booktitle     = "{Proceedings of the Sixth International Conference on Principles of Knowledge Representation and Reasoning}",
	pages         = "86--97",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Preferred Answer Sets for Extended Logic Programs}",
	year          = 1998,
}