1. A. P. Kopylov, ?Boundary values of mappings close to an isometry,? Sib. Mat. Zh.,25, No. 3, 120?131 (1984).
2. V. A. Aleksandrov, ?Isometry of domains in Rn and relative isometry of their boundaries,? ibid., 3?13 (1984).
3. Extrinsic Geometry of Convex Surfaces, Am. Math. Soc., Providence (1973).
4. E. P. Sen'kin, ?Rigidity of convex hypersurfaces,? Ukr. Geometr. Sb.,12, 131?152 (1972).
5. A. D. Aleksandrov, ?On a class of closed surfaces,? Mat. Sb.,4(46), No. 1, 69?77 (1938).