Done, G. C., K. L. Bondar, and P. U. Chopade. “Existence and Uniqueness of Solution of Summation-Difference Equation of Finite Delay in Cone Metric Space”. Communications in Mathematics and Applications 11, no. 3 (September 30, 2020): 325–334. Accessed May 1, 2024. https://www.rgnpublications.com/journals/index.php/cma/article/view/1395.