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Dyfyniad Arddull ChicagoKaufmann, A. Introduction to the Theory of Fuzzy Subsets V.1. New York: Academic Press, 1975.
Dyfyniad MLAKaufmann, A. Introduction to the Theory of Fuzzy Subsets V.1. Academic Press, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.