@article{SOSP-J-1973-SchroederS72,
	author        = "Michael D. Schroeder and Jerome H. Saltzer",
	doi           = "10.1145/361268.361275",
	journal       = "{Communications of the ACM}",
	number        = 3,
	pages         = "157--170",
	publisher     = "{ACM}",
	title         = "{A Hardware Architecture for Implementing Protection Rings}",
	volume        = 15,
	year          = 1972,
}