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Dyfyniad Arddull ChicagoHellwege, K H. Landolt-bornstein, Vol.5: Numerical Data and Functional Relationships in Science and Technology. Springer-Verlag, New York, 1970.
Dyfyniad MLAHellwege, K H. Landolt-bornstein, Vol.5: Numerical Data and Functional Relationships in Science and Technology. 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.