@inproceedings{KR-1991-Bylander,
	author        = "Tom Bylander",
	booktitle     = "{Proceedings of the Second International Conference on Principles of Knowledge Representation and Reasoning}",
	isbn          = "1-55860-165-1",
	pages         = "70--77",
	publisher     = "{Morgan Kaufmann}",
	title         = "{The Monotonic Abduction Problem: A Functional Characterization on the Edge of Tractability}",
	year          = 1991,
}