@inproceedings{SAC-1993-Yalcinalp,
	author        = "L. Ümit Yalçinalp",
	booktitle     = "{Proceedings of the Eighth Symposium on Applied Computing: States of the Art and Practice}",
	doi           = "10.1145/162754.168690",
	pages         = "598--603",
	publisher     = "{ACM Press}",
	title         = "{Ushell: An Environment for Introduction to Logic Programming}",
	year          = 1993,
}