@inproceedings{ML-1989-Quinlan,
	author        = "J. Ross Quinlan",
	booktitle     = "{Proceedings of the Sixth International Workshop on Machine Learning}",
	isbn          = "1-55860-036-1",
	pages         = "164--168",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Unknown Attribute Values in Induction}",
	year          = 1989,
}