@inproceedings{ISLP-1991-Wadge,
	author        = "William W. Wadge",
	booktitle     = "{Proceedings of the Eighth International Symposium on Logic Programming}",
	isbn          = "0-262-69147-7",
	pages         = "289--303",
	publisher     = "{MIT Press}",
	title         = "{Higher-Order Horn Logic Programming}",
	year          = 1991,
}