Team, S. “Strong Convergence Theorems for Fixed Points of Nonexpansive Semigroups: Sun Young Cho, Shin Min Kang”. Thai Journal of Mathematics, vol. 9, no. 3, Dec. 2011, pp. 497-04, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/280.