Sukh Raj Singh, R. D. Daheriya, Rashmi Jain, and Manoj Ughade. 2016. “Fixed Point Theorem for Contractions of Rational Type in Ordered 2-Metric Spaces”. International Journal of Mathematics And Its Applications 4 (2 - C):133-47. https://ijmaa.in/index.php/ijmaa/article/view/1054.