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Dyfyniad Arddull ChicagoKeen, Linda, and Nikola Lakic. Hyperbolic Geometry from a Local Viewpoint. Cambridge: Cambridge University, 2007.
Dyfyniad MLAKeen, Linda, and Nikola Lakic. Hyperbolic Geometry from a Local Viewpoint. Cambridge University, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.