Plubtieng, S., P. Kumam, S. Dhompongsa, and P. Saiparae. “On the Result of P-Contraction Operators”. Nonlinear Convex Analysis and Optimization: An International Journal on Numerical, Computation and Applications, vol. 1, no. 2, July 2022, pp. 113-29, https://bangmodjmcs.com/index.php/ncao/article/view/80.