Uncertainty in artificial intelligence 4 edited by Ross D. Shachter, Tod S. Levitt, Laveen N. Kanal, John F. Lemmer - Amsterdam North-Holland 1990 - 422 p. : ill. ; 23 cm. - Machine intelligence and pattern recognition v.9 . p. 421-422 ISBN: 0444886508 Subjects--Topical Terms: Artificial intelligenceUncertainty (Information theory)