I. G., Ezugorie. “GLOBAL ASYMPTOTIC STABILITY ANALYSIS OF A SECOND-ORDER DUFFING EQUATION WITH POISON STABLE COEFFICIENT”. GPH-International Journal of Mathematics 8, no. 7 (August 18, 2025): 146-156. Accessed January 10, 2026. https://www.gphjournal.org/index.php/m/article/view/2050.