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Springer, 2005 Beltrami, Eugenio Teoria fondamentale degli spazî di curvatura costante, Annali. di Mat., ser II 2 (1868), 232–255 Blumenthal, Leonard...
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1813 that Gauss had come to accept the existence of a new geometry. Beltrami, Eugenio (1868) "Teoria fondamentale degli spazî di curvatura costante",...
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in una varietà qualunque e conseguente specificazione geometrica della curvatura Riemanniana", Rend. Circ. Mat. Palermo, 42: 173–205, doi:10.1007/bf03014898...
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arXiv:math/0702842, doi:10.1007/s11856-011-0008-6 Chern, Shiing-Shen (1945), "On the curvatura integra in a Riemannian manifold", Annals of Mathematics, Second Series...
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