@inproceedings{ICLP-1991-BallanceG,
	author        = "Robert A. Ballance and Susan L. Graham",
	booktitle     = "{Proceedings of the Eighth International Conference on Logic Programming}",
	isbn          = "0-262-56058-5",
	pages         = "895--909",
	publisher     = "{MIT Press}",
	title         = "{Incremental Consistency Maintenance for Interactive Applications}",
	year          = 1991,
}