Ibaraki, T., and Y. Kimura. 2011. “CONVERGENCE OF NONLINEAR PROJECTIONS AND SHRINKING PROJECTION METHODS FOR COMMON FIXED POINT PROBLEMS”. Journal of Nonlinear Analysis and Optimization: Theory & Applications 2 (1):225-38. http://www.math.sci.nu.ac.th/ojs302/index.php/jnao/article/view/29.