Thach, Le Ngoc, and Tran Van Lien. “Forced Nonlinear Vibration of Shallow Shell and Application to Technical Diagnosis”. <i>Vietnam Journal of Mechanics</i> 28, no. 3 (October 1, 2006): 189–196. Accessed January 1, 2026. https://vjs.ac.vn/vjmech/article/view/5578.