@inproceedings{KR-1998-CostelloP,
	author        = "Tom Costello and Anna Patterson",
	booktitle     = "{Proceedings of the Sixth International Conference on Principles of Knowledge Representation and Reasoning}",
	pages         = "270--281",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Quantifiers and Operations on Modalities and Contexts}",
	year          = 1998,
}