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Dyfyniad Arddull ChicagoLiu, Chung Laung. Elements of Discrete Mathematics. New York: McGraw-Hill, 1977.
Dyfyniad MLALiu, Chung Laung. Elements of Discrete Mathematics. McGraw-Hill, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.