Janos Bolyai Gallery
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Tamás Dénes, Real Face of János Bolyai, «Notices», Volume 58, Number 1, January 2011, pp. 41-51 (pdf
Sulla scienza assoluta dello spazio per Giovanni Bolyai, [János Bolyai, Appendix. Scientiam spatii a
Sulla scienza assoluta dello spazio per Giovanni Bolyai, [János Bolyai, Appendix. Scientiam spatii a
Eugenio Beltramy and Non-Euclidian Geometry ift.tt/1q84ZPx
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