Khiem, N. T., L. K. Toan, and N. T. L. Khue. “Change in Mode Shape Nodes of Multiple Cracked Bar: II. The Numerical Analysis”. <i>Vietnam Journal of Mechanics</i> 35, no. 4 (November 22, 2013): 299–311. Accessed November 9, 2025. https://vjmech.vast.vn/vjmech/article/view/2487.