Aydi, H., & Berzig, M. (2012). COINCIDENCE POINT THEOREMS IN HIGHER DIMENSION FOR NONLINEAR CONTRACTIONS. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO), 4(1), 53–64. retrieved from https://ph03.tci-thaijo.org/index.php/jnao/article/view/2685