[1] Y. CENSOR: 
Row-action methods for huge and sparse systems and their application. SIAM Rev. Vol. 23: 444-466 (1981). 
MR 0636080[2] A. DE PIERRO A. N. IUSEM: A Simultaneous Projections Method for Linear Inequalities. To be published in Linear Algebra and its Applications.
[3] A. DE PIERRO A. N. IUSEM: A Parallel Projection Method for Finding a Common Point of a Family of Convex Sets. Informes de Matemática, Série B-021/84 IMPA, Rio de Janeiro, (1984).
[4] A. DE PIERRO A. N. IUSEM: A Simultaneous Iterative Method for Computing Projections on Polyhedra. To be published.
[5] G. T. HERMAN: 
Image Reconstruction from Projections: The Fundamentals of Computerized Tomography. Academic Press, New York, 1980. 
MR 0630896 | 
Zbl 0538.92005[6] G. T. HERMAN A. LENT: Iterative Reconstruction Algorithms. Comput. Biol. Med. 6: 273-294 (1976),
[7] R. J. ROCKAFELLER: Convex Analysis. Cambridge Univ. Press. Cambridge, Mass. (1970).