References Pseudosphere

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stillwell, j. (1996). sources of hyperbolic geometry. amer. math. soc & london math. soc. 
henderson, d. w.; taimina, d. (2006). experiencing geometry: euclidean , non-euclidean history . aesthetics , mathematics (pdf). springer-verlag. 
kasner, edward; newman, james (1940). mathematics , imagination. simon & schuster. p. 140, 145, 155. 






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