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[1] I.M. Yaglom; Translated by Abe Shenitzer, Geometric Transformations III, pp.20-22 [2] I.M. Yaglom; Translated by Abe Shenitzer, Geometric Transformations III, pp.175-158 [3] Coxeter, Harold Scott MacDonald (1969), Introduction to Geometry, New York: John Wiley & Sons [4] Hilbert, David; Cohn-Vossen, Stephan (1952), Geometry and the Imagination, Chelsea, pp. 119–128
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