Murugesan, A., and C. Soundara Rajan. “Asymptotic Behavior of Oscillatory Solutions of First Order Functional Delay Difference Equations”. International Journal of Applied Mathematical Research 4, no. 2 (March 8, 2015): 234–244. Accessed April 29, 2024. https://www.sciencepubco.com/index.php/ijamr/article/view/4234.