Team, S. “Common Fixed Point of Generalized Rational Type Contraction Mappings in Partially Ordered Metric Spaces: Sumit Chandok, Erdal Karapinar”. Thai Journal of Mathematics, vol. 11, no. 2, Aug. 2013, pp. 251-60, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/373.