Harun Or Roshid, and M. Zulfikar Ali. “Asymptotic Solutions of Fifth Order Overdamped-Oscillatory Nonlinear Systems”. Contemporary Mathematics 1, no. 4 (September 10, 2020): 243–252. Accessed April 19, 2024. https://ojs.wiserpub.com/index.php/CM/article/view/496.