@inproceedings{KR-1992-DoniniLNSN,
	author        = "Francesco M. Donini and Maurizio Lenzerini and Daniele Nardi and Andrea Schaerf and Werner Nutt",
	booktitle     = "{Proceedings of the Third International Conference on Principles of Knowledge Representation and Reasoning}",
	isbn          = "1-55860-262-3",
	pages         = "342--353",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Adding Epistemic Operators to Concept Languages}",
	year          = 1992,
}