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Dyfyniad Arddull ChicagoKelly, A., and Robin Nicholson. Strengthening Methods in Crystals. Amsterdam: Elsevier Pub. Co., 1971.
Dyfyniad MLAKelly, A., and Robin Nicholson. Strengthening Methods in Crystals. Elsevier Pub. Co., 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.