1. A.D. Aleksandrov. Convex Polyhedra. GITTL, Moskow, USSR (In Russian), German transl.: Konvexe Polyeder, Akademie-Verlag, Berlin, 1958, 1950.
2. A.D. Aleksandrov. Uniqueness theorems for hypersurfaces in the large, i. Vestnik LGU, 19: 5–17, 1956.
3. I.J. Bakelman. Convex Analysis and Nonlinear Geometric Elliptic Equations. Springer-Verlag, Berlin, 1994.
4. A. Baldes and O. Wohlrab. Convex discrete solutions of generalized Monge-Ampère equations. Preprint, SFB 256, Universitat Bonn, Germany, 1989.
5. M. Born and E. Wolf. Principles of Optics. Pergamon Press, Elmsford, NY, 6 edition, 1989.