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[2] M. P. do CARMO, Differential Geometry of Curves and Surfaces, Prentice Hall, 1976

[3] A. GRAY, Modern Differential Geometry of Curves and Surfaces, CRC Press, 1997

[4] A. PRESSLEY, Elementary Differential Geometry, Springer-Verlag, 2001

[5] R. RUCKER, How flies fly: The Curvature and Torsion of Space Curves, in Puzzlers' Tribute, a feast for the mind, A. K. Peters Ltd., 2001

[6] M. SPIVAK, A comprehensive introduction to differential geometry (3rd ed.), Publish or Perish Inc., 1999