1. Proceedings of Symposia in Pure Mathematics;L. Danzer,1983
2. B. Grünbaum,Convex Polytopes, Interscience Publishers, London-New York-Sydney, 1967.
3. L. A. Santaló,Sobre los sistemas completos de desigualdades entre tres elementos de una figura convexa plana, Math. Notae17 (1959/61), 82–104.
4. P. R. Scott,Two inequalities for convex sets in the plane, Bull. Austral. Math. Soc.19 (1978), 131–133.
5. P. R. Scott,A family of inequalities for convex sets, Bull. Austral. Math. Soc.20 (1979), 237–245.