.
Καμπύλη του Viviani
Teixeira, F. G. Traité des courbes spéciales remarquables plane et gauches, Vol. 2. Coimbra, Portugal, 1908-1915. Reprinted New York: Chelsea, 1971 and Paris: Gabay.
Gray, A. "Viviani's Curve." §8.6 in Modern Differential Geometry of Curves and Surfaces with Mathematica, 2nd ed. Boca Raton, FL: CRC Press, pp. 201-202, 1997.
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