1. Alexander, R. Problem 15. The geometry of metric and linear spaces (Proc. Conf., Michigan State Univ., East Lansing, Mich., 1974) p. 240. Lecture Notes in Math. Vol. 490, Springer, Berlin 1975. MR 53, 6419.
2. Auerbach, H. Sur un problème de M. Ulam concernant l’équilibre des corps flottants. Studia Math. 7 (1938), 121–142. Zbl. 18, p. 175.
3. Beck, A., M.N. Bleicher Packing convex sets into similar sets. Acta Math. Acad. Sci. Hung. 22 (3–4) (1971/72), 283–303. MR 45, 7613.
4. Benson, R.V. Euclidean geometry and convexity. McGraw-Hill Co., New York-Toronto-London 1966. MR 35, 844.
5. Beretta, L., A. Maxia Insiemi convessi e orbiformi. Univ. Roma e Ist. Naz. Alta Mat. Rend. Mat. (5)1(1940), 1–64. MR 1, p. 264.