Murugesan, A., and P. Sowmiya. “Necessary and Sufficient Conditions for Oscillations of First Order Neutral Delay Difference Equations With Constant Coefficients”. International Journal of Advanced Mathematical Sciences 3, no. 1 (April 22, 2015): 12–24. Accessed November 21, 2024. https://sciencepubco.com/index.php/IJAMS/article/view/4462.