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Dyfyniad Arddull ChicagoDaintith John. Biographical Encyclopedia of Scientists. 2 5. Institute of physics publishing: London, 1994.
Dyfyniad MLADaintith John. Biographical Encyclopedia of Scientists. 2 5. London, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.