@inproceedings{ML-1989-Langley,
	author        = "Pat Langley",
	booktitle     = "{Proceedings of the Sixth International Workshop on Machine Learning}",
	isbn          = "1-55860-036-1",
	pages         = "2--4",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Unifying Themes in Empirical and Explanation-Based Learning}",
	year          = 1989,
}