Team, Support. “On Common Fixed Points and Best Approximation on Nonconvex Sets: Sumit Chandok, T. D. Narang”. Thai Journal of Mathematics 7, no. 2 (December 1, 2009): 285–292. Accessed May 1, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/161.