@inproceedings{PPDP-2005-Gabbay,
	author        = "Murdoch Gabbay",
	booktitle     = "{Proceedings of the Seventh International Conference on Principles and Practice of Declarative Programming}",
	doi           = "10.1145/1069774.1069783",
	isbn          = "1-59593-090-6",
	pages         = "94--105",
	publisher     = "{ACM}",
	title         = "{A new calculus of contexts}",
	year          = 2005,
}