REFERENCES
- J. Favard, Définition de la longeur et de l'aire, C. R. Acad. Sci. Paris 194 (1932) 344–346.
- L. A. Santaló, Integral Geometry and Geometric Probability, Addison-Wesley, London-Amsterdam, 1976.
- S. Sherman, A comparison of linear measures in the plane, Duke Math. Journal 9 (1942) 1–9.