Ibaraki, T., and Y. Kimura. “CONVERGENCE OF NONLINEAR PROJECTIONS AND SHRINKING PROJECTION METHODS FOR COMMON FIXED POINT PROBLEMS”. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO), vol. 2, no. 1, Dec. 2011, pp. 225-38, https://ph03.tci-thaijo.org/index.php/jnao/article/view/2630.