1. Chouikha, A.R., (1999), Problems on polygons and Bonnesen-type inequalities, Indag. Mathem., vol 10(4), pp. 495–506.
2. Chouikha, A.R., (1988), Problème de P. Levy sur les polygones articulés, C. R. Math. Report, Acad of Sc. of Canada, vol 10, pp. 175–180.
3. Ku, H.T., Ku, M.C., and Zhang, X.M. (1995), Analytic and geometric isoperimetric inequalities, J. of Geometry, vol 53, pp. 100–121.
4. Levy, P. (1966), Le problème des isoperimetries et des polygones articulés, Bull. Sc. Math., 2eme serie, 90, pp. 103–112.
5. Osserman, R. (1979), Bonnesen-style isoperimetric inequalities, Amer. Math. Monthly, vol 1, pp. 1–29.