Team, S. “Coupled Coincidence Point Theorems for a $(\beta,g)$-$\psi$-Contractive Mapping in Partially Ordered $G$-Metric Spaces: P. Charoensawan, C. Thangthong”. Thai Journal of Mathematics, vol. 13, no. 1, Apr. 2015, pp. 43-61, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/490.