@inproceedings{KR-1991-FrischS,
	author        = "Alan M. Frisch and Richard B. Scherl",
	booktitle     = "{Proceedings of the Second International Conference on Principles of Knowledge Representation and Reasoning}",
	isbn          = "1-55860-165-1",
	pages         = "196--207",
	publisher     = "{Morgan Kaufmann}",
	title         = "{A General Framework for Modal Deduction}",
	year          = 1991,
}