@inproceedings{POPL-1978-HarelP,
	author        = "David Harel and Vaughan R. Pratt",
	booktitle     = "{Conference Record of the Fifth Annual Symposium on Principles of Programming Languages}",
	doi           = "10.1145/512760.512782",
	editor        = "Alfred V. Aho and Stephen N. Zilles and Thomas G. Szymanski",
	pages         = "203--213",
	publisher     = "{ACM Press}",
	title         = "{Nondeterminism in Logics of Programs}",
	year          = 1978,
}