@inproceedings{ESOP-1988-DietrichH,
	author        = "Roland Dietrich and Frank Hagl",
	booktitle     = "{Proceedings of the Second European Symposium on Programming}",
	doi           = "10.1007/3-540-19027-9_6",
	editor        = "Harald Ganzinger",
	isbn          = "3-540-19027-9",
	pages         = "79--93",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{A Polymorphic Type System with Subtypes for Prolog}",
	volume        = 300,
	year          = 1988,
}