1. Finding the common point of convex sets by the method of successive projections;Bregman;Dokl. Akad. Nauk. USSR,1965
2. The method of projections for finding the common point if convex sets;Gubin;USSR Comput. Math. Phys.,1967
3. Continuous Geometry;Von Neumann,1937
4. The Geometry of Orthogonal Spaces;Van Neumann,1950
5. Spectral Theory in the Hilbert Space;Nakano,1953