@inproceedings{SOSP-1973-Ullman,
	author        = "Jeffrey D. Ullman",
	booktitle     = "{Proceedings of the Fourth Symposium on Operating System Principles}",
	doi           = "10.1145/800009.808055",
	pages         = "96--101",
	publisher     = "{ACM}",
	title         = "{Polynomial Complete Scheduling Problems}",
	year          = 1973,
}