Bhavana Deshpande, Amrish Handa, and Chetna kothari. “Coincidence Point Theorem Under Mizoguchi-Takahashi Contraction on Ordered Metric Spaces With Application”. International Journal of Mathematics And Its Applications, vol. 3, no. 4 - A, Dec. 2015, pp. 75-94, http://ijmaa.in/index.php/ijmaa/article/view/487.