@inproceedings{POPL-1997-AptS,
	author        = "Krzysztof R. Apt and Andrea Schaerf",
	booktitle     = "{Conference Record of the 24th Symposium on Principles of Programming Languages}",
	doi           = "10.1145/263699.263709",
	editor        = "Peter Lee and Fritz Henglein and Neil D. Jones",
	isbn          = "0-89791-853-3",
	pages         = "67--79",
	publisher     = "{ACM Press}",
	title         = "{Search and Imperative Programming}",
	year          = 1997,
}