On Application of Lyapunov and Yoshizawa’s Theorems on Stability, Asymptotic Stability, Boundaries and Periodicity of Solutions of Duffing’s Equation. AJAS [Internet]. 2014 Dec. 15 [cited 2026 Mar. 4];2(6). Available from: https://ajouronline.com/index.php/AJAS/article/view/2034