@inproceedings{ESOP-1999-BartheF,
	author        = "Gilles Barthe and Maria João Frade",
	booktitle     = "{Proceedings of the Eighth European Symposium on Programming}",
	doi           = "10.1007/3-540-49099-X_8",
	editor        = "S. Doaitse Swierstra",
	isbn          = "3-540-65699-5",
	pages         = "109--127",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Constructor Subtyping}",
	volume        = 1576,
	year          = 1999,
}