Anh, Nguyen Dong, Ninh Quang Hai, and Werner Schiehlen. “Extended Averaged Equation Method and Application on Analyzing Some Nonlinear Deterministic Vibrations”. Vietnam Journal of Mechanics 31, no. 1 (March 18, 2009): 1–16. Accessed April 18, 2024. https://vjs.ac.vn/index.php/vjmech/article/view/5490.