Ali Mohamad, Hussain, and Intidhar Zamil Mushtt. “Asymptotic Behavior of Second Order Non-Linear Neutral Differential Equations”. Journal of Al-Qadisiyah for Computer Science and Mathematics 7, no. 1 (August 10, 2017): 15–27. Accessed December 21, 2024. https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/80.