@inproceedings{KR-2002-BrandtKT,
	author        = "Sebastian Brandt and Ralf Küsters and Anni-Yasmin Turhan",
	booktitle     = "{Proceedings of the Eighth International Conference on Principles of Knowledge Representation and Reasoning}",
	isbn          = "1-55860-554-1",
	pages         = "203--214",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Approximation and Difference in Description Logics}",
	year          = 2002,
}