@inproceedings{CCPSD-1991-Hanus,
	author        = "Michael Hanus",
	booktitle     = "{Proceedings of the Fourth International Joint Conference on Theory and Practice of Software Development, Volume 2: Colloquium on Combining Paradigms for Software Development}",
	doi           = "10.1007/3540539816_67",
	isbn          = "3-540-53981-6",
	pages         = "181--200",
	publisher     = "{Springer}",
	title         = "{Parametric Order-Sorted Types in Logic Programming}",
	year          = 1991,
}