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Dyfyniad Arddull ChicagoLord, Eric A. Tensors Relativity and Cosmology. New Delhi: Tata McGraw-Hill, 1976.
Dyfyniad MLALord, Eric A. Tensors Relativity and Cosmology. Tata McGraw-Hill, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.