@inproceedings{POPL-1978-DemersDS,
	author        = "Alan J. Demers and James E. Donahue and Glenn Skinner",
	booktitle     = "{Conference Record of the Fifth Annual Symposium on Principles of Programming Languages}",
	doi           = "10.1145/512760.512764",
	editor        = "Alfred V. Aho and Stephen N. Zilles and Thomas G. Szymanski",
	pages         = "23--30",
	publisher     = "{ACM Press}",
	title         = "{Data Types as Values: Polymorphism, Type-Checking, Encapsulation}",
	year          = 1978,
}