Team, S. “Some Coincidence Points Theorems for Multi-Valued F-Weak Contractions on Complete Metric Space Endowed With a Graph: Phumin Sumalai, Poom Kumam, Chaowalit Panthong”. Thai Journal of Mathematics, Sept. 2016, pp. 61-76, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/552.