@inproceedings{POPL-2001-Sewell,
	author        = "Peter Sewell",
	booktitle     = "{Conference Record of the 28th Symposium on Principles of Programming Languages}",
	doi           = "10.1145/360204.360225",
	editor        = "Chris Hankin and Dave Schmidt",
	isbn          = "1-58113-336-7",
	pages         = "236--247",
	publisher     = "{ACM}",
	title         = "{Modules, abstract types, and distributed versioning}",
	year          = 2001,
}