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Dyfyniad Arddull ChicagoHeijl, Anders. Studies on Computerized Perimetry. Copenhagen: Scriptor, 1977.
Dyfyniad MLAHeijl, Anders. Studies on Computerized Perimetry. Scriptor, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.