@inproceedings{POPL-1978-OgdenRR,
	author        = "William F. Ogden and William E. Riddle and William C. Rounds",
	booktitle     = "{Conference Record of the Fifth Annual Symposium on Principles of Programming Languages}",
	doi           = "10.1145/512760.512780",
	editor        = "Alfred V. Aho and Stephen N. Zilles and Thomas G. Szymanski",
	pages         = "185--194",
	publisher     = "{ACM Press}",
	title         = "{Complexity of Expressions Allowing Concurrency}",
	year          = 1978,
}