@inproceedings{POPL-1992-Ma,
	author        = "QingMing Ma",
	booktitle     = "{Conference Record of the 19th Annual Symposium on Principles of Programming Languages}",
	doi           = "10.1145/143165.143225",
	editor        = "Ravi Sethi",
	isbn          = "0-89791-453-8",
	pages         = "281--292",
	publisher     = "{ACM Press}",
	title         = "{Parametricity as Subtyping}",
	year          = 1992,
}