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Dyfyniad Arddull ChicagoGorter, C.J. Progress in Low Temperature Physics. Amsterdam: North-Holland Publishing Company, 1970.
Dyfyniad MLAGorter, C.J. Progress in Low Temperature Physics. North-Holland Publishing Company, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.