Lien, Tran Van, Ngo Trong Duc, and Nguyen Tien Khiem. “Mode Shape Analysis of Multiple Cracked Functionally Graded Beam-Like Structures by Using Dynamic Stiffness Method”. <i>Vietnam Journal of Mechanics</i> 39, no. 3 (September 23, 2017): 215–228. Accessed November 8, 2025. https://vjmech.vast.vn/vjmech/article/view/8631.