R. A. Rashwan, and S. M. Saleh. 2014. “Some Common Fixed Point Theorems for Four $(\psi,\varphi)$-Weakly Contractive Mappings Satisfying Rational Expressions in Ordered Partial Metric Spaces”. *International Journal of Mathematics And Its Applications* 2 (3):29-51. http://ijmaa.in/index.php/ijmaa/article/view/309.