@article{SOSP-1967-Graham68,
	author        = "Robert M. Graham",
	doi           = "10.1145/363095.363146",
	journal       = "{Communications of the ACM}",
	number        = 5,
	pages         = "365--369",
	title         = "{Protection in an information processing utility}",
	volume        = 11,
	year          = 1968,
}