@inproceedings{ML-1990-Valtorta,
	author        = "Marco Valtorta",
	booktitle     = "{Proceedings of the Seventh International Workshop on Machine Learning}",
	isbn          = "1-55860-141-4",
	pages         = "419--426",
	publisher     = "{Morgan Kaufmann}",
	title         = "{More Results on the Complexity of Knowledge Base Refinement: Belief Networks}",
	year          = 1990,
}