@inproceedings{SOSP-1969-Johnston,
	author        = "John B. Johnston",
	booktitle     = "{Proceedings of the Second Symposium on Operating Systems Principles}",
	doi           = "10.1145/961053.961084",
	pages         = "80--82",
	publisher     = "{ACM}",
	title         = "{Structure of multiple activity algorithms}",
	year          = 1969,
}