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Dyfyniad Arddull ChicagoHalder, Kangkan, and Banasri Roy Choudhuri. Trueman's Specific Series UGC-CSIR, JRF/LS Chemical Sciences. New Delhi: Danika Publishing Co, 2006.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.