Gw mau tau 1890. "Nicht-Euklidische Geometrie " dari Felix Klein

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Tobies, Renate (with Fritz König) Felix Klein. Teubner Verlag, Leipzig 1981.

Rowe, David "Felix Klein, David Hilbert, and the Göttingen Mathematical Tradition", in Science in Germany: The Intersection of Institutional and Intellectual Issues, Kathryn Olesko, ed., Osiris, 5 (1989), 186-213.