1. Aleksandrov, A. D.: Uniqueness theorems for surfaces in the large I?V. Am. Math. Soc. Transl. (2),21, 341?416 (1962).
2. Chern, S. S.: Integral formulas for hypersurfaces in Euclidean space and their applications to uniqueness theorems. J. Math. Mech.8, 947?955 (1959).
3. ??, andC. C. Hsiung: A uniqueness theorem on closed convex hypersurfaces in Euclidean space. J. Math. Mech.9, 85?88 (1960).
4. Schneider, R.: Eine Kennzeichnung der Kugel. Archiv Math. XVI, 235?240 (1965).
5. ?? OnA. D. Aleksandrov's inequalities for mixed discriminants. J. Math. Mech.15, 285?290 (1966).