@inproceedings{SOSP-1977-NeedhamW,
	author        = "Roger M. Needham and R. D. H. Walker",
	booktitle     = "{Proceedings of the Sixth Symposium on Operating System Principles}",
	doi           = "10.1145/800214.806541",
	pages         = "1--10",
	publisher     = "{ACM}",
	title         = "{The Cambridge CAP Computer and its Protection System}",
	year          = 1977,
}