Ritu Sahu, P. L. Sanodia, and Arvind Gupta. “Some Fixed Point Theorems under Generalized Expansion Principle With Control Function”. International Journal of Mathematics And its Applications 3, no. 4 - A (December 1, 2015): 23–25. Accessed July 22, 2024. https://ijmaa.in/index.php/ijmaa/article/view/483.