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Dyfyniad Arddull ChicagoPrakash, Nirmala. Differential Geometry. New Delhi: Tata McGraw-Hill, 1981.
Dyfyniad MLAPrakash, Nirmala. Differential Geometry. Tata McGraw-Hill, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.