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Dyfyniad Arddull ChicagoRohatgi, P.K, K.G Satyanarayana, and S. Mohan. Materials Science and Technology in the Future of Kerela. Trivandrum: Regional Research laboratory, 1981.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.