@inproceedings{SOSP-1975-CohenJ,
	author        = "Ellis S. Cohen and David Jefferson",
	booktitle     = "{Proceedings of the Fifth Symposium on Operating System Principles}",
	doi           = "10.1145/800213.806532",
	pages         = "141--160",
	publisher     = "{ACM}",
	title         = "{Protection in the HYDRA Operating System}",
	year          = 1975,
}