@inproceedings{POPL-2002-SuANPT,
	author        = "Zhendong Su and Alexander Aiken and Joachim Niehren and Tim Priesnitz and Ralf Treinen",
	booktitle     = "{Conference Record of the 29th Symposium on Principles of Programming Languages}",
	doi           = "10.1145/503272.503292",
	editor        = "John Launchbury and John C. Mitchell",
	isbn          = "1-58113-450-9",
	pages         = "203--216",
	publisher     = "{ACM}",
	title         = "{The first-order theory of subtyping constraints}",
	year          = 2002,
}