@inproceedings{POPL-1985-Leivant,
	author        = "Daniel Leivant",
	booktitle     = "{Conference Record of the 12th Annual Symposium on Principles of Programming Languages}",
	doi           = "10.1145/318593.318625",
	editor        = "Mary S. Van Deusen and Zvi Galil and Brian K. Reid",
	isbn          = "0-89791-147-4",
	pages         = "132--140",
	publisher     = "{ACM Press}",
	title         = "{Logical and Mathematical Reasoning about Imperative Programs}",
	year          = 1985,
}