@inproceedings{ML-1991-WirthO,
	author        = "Rüdiger Wirth and Paul O'Rorke",
	booktitle     = "{Proceedings of the Eighth International Workshop on Machine Learning}",
	isbn          = "1-55860-200-3",
	pages         = "457--461",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Constraints on Predicate Invention}",
	year          = 1991,
}