@inproceedings{SOSP-1971-SchroederS,
	author        = "Michael D. Schroeder and Jerome H. Saltzer",
	booktitle     = "{Proceedings of the Third Symposium on Operating System Principles}",
	doi           = "10.1145/800212.806498",
	pages         = "42--54",
	publisher     = "{ACM}",
	title         = "{A Hardware Architecture for Implementing Protection Rings}",
	year          = 1971,
}