Khiem, Nguyen Tien. “An Approach to Study Vibration in Stochastic Systems Based on the Asymptotic Method”. <i>Vietnam Journal of Mechanics</i> 29, no. 3 (September 22, 2007): 375–384. Accessed January 12, 2026. https://vjmech.vast.vn/vjmech/article/view/5546.