Bich, Dao Huy, and Nguyen Dang Bich. “A Coupling Successive Approximation Method for Solving Duffing Equation and Its Application”. <i>Vietnam Journal of Mechanics</i> 36, no. 2 (June 10, 2014): 77–93. Accessed November 9, 2025. https://vjmech.vast.vn/vjmech/article/view/4095.