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Dyfyniad Arddull ChicagoFridkin, V.M. Photoelectrets and the Electrophotographic Process. Princeton, New Jersey: Van Nostrand, 1966.
Dyfyniad MLAFridkin, V.M. Photoelectrets and the Electrophotographic Process. Van Nostrand, 1966.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.