@inproceedings{SOSP-1969-Wulf,
	author        = "William A. Wulf",
	booktitle     = "{Proceedings of the Second Symposium on Operating Systems Principles}",
	doi           = "10.1145/961053.961105",
	pages         = "175--181",
	publisher     = "{ACM}",
	title         = "{Performance monitors for multi-programming systems}",
	year          = 1969,
}