References
- Hamburger Mathematische Einzelschriften Vorlesungen uber Integralgeometrie W. Blaschke
- Annales de la Soc. Polonaise v.20 Sur la courbure totale des courbes fermees K. Borsuk
- Acta. Sci. Math. v.12 Sur certaines inegalties geometriques I. Fary
- Annals of Math. v.52 On the total curvature of knots J. W. Milnor https://doi.org/10.2307/1969467
- Duke Math. J. v.9 Integral formulas in Crofton's style on the sphere and some inequalities referring to spherical curves L. A. Santalo
- Integral geometry and geometric probability