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Dyfyniad Arddull ChicagoLovasz, Laszlo,ed, Laszlo Lovasz, and Vera T. Sos. Algebraic Methods in Graph Theory.v.2. Amsterdam ; New York: North-Holland, 1981.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.