Arunchai, A., S. Suppalap, and W. Tapanyo. “BEST PROXIMITY POINTS INVOLVING SIMULATION FUNCTIONS WITH $(\tau)$-DISTANCE”. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO), vol. 9, no. 2, Dec. 2018, pp. 115-27, https://ph03.tci-thaijo.org/index.php/jnao/article/view/2874.