@inproceedings{ML-1989-RasZ,
	author        = "Zbigniew W. Ras and Maria Zemankova",
	booktitle     = "{Proceedings of the Sixth International Workshop on Machine Learning}",
	isbn          = "1-55860-036-1",
	pages         = "314--319",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Imprecise Concept Learning within a Growing Language}",
	year          = 1989,
}