@inproceedings{PS-1981-Horning,
	author        = "James J. Horning",
	booktitle     = "{Proceedings of a Workshop on Program Specification}",
	doi           = "10.1007/3-540-11490-4_2",
	isbn          = "3-540-11490-4",
	pages         = "5--24",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Issues and Observations}",
	volume        = 134,
	year          = 1981,
}