Karapinar, E., and H. K. Nashine. 2013. “FIXED POINT THEOREMS FOR KANNAN TYPE CYCLIC WEAKLY CONTRACTIONS”. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) 4 (1):29-35. https://ph03.tci-thaijo.org/index.php/jnao/article/view/2682.