@inproceedings{KR-1992-CadoliS,
	author        = "Marco Cadoli and Marco Schaerf",
	booktitle     = "{Proceedings of the Third International Conference on Principles of Knowledge Representation and Reasoning}",
	isbn          = "1-55860-262-3",
	pages         = "330--341",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Approximation in Concept Description Languages}",
	year          = 1992,
}