@inproceedings{POPL-1996-GordonR,
	author        = "Andrew D. Gordon and Gareth D. Rees",
	booktitle     = "{Conference Record of the 23rd Symposium on Principles of Programming Languages}",
	doi           = "10.1145/237721.237807",
	editor        = "Hans-Juergen Boehm and Guy L. Steele Jr.",
	isbn          = "0-89791-769-3",
	pages         = "386--395",
	publisher     = "{ACM Press}",
	title         = "{Bisimilarity for a First-Order Calculus of Objects with Subtyping}",
	year          = 1996,
}