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Dyfyniad Arddull ChicagoCallahan, James. The Geometry of Spacetime: An Introduction to Special and General Relativity. New York: Springer, 2000.
Dyfyniad MLACallahan, James. The Geometry of Spacetime: An Introduction to Special and General Relativity. Springer, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.