Khiem, Nguyen Tien, Le Khanh Toan, and Nguyen Thi Linh Khue. “Change in Mode Shape Nodes of Multiple Cracked Bar: I. The Theoretical Study”. <i>Vietnam Journal of Mechanics</i> 35, no. 3 (September 20, 2013): 175–188. Accessed November 9, 2025. https://vjmech.vast.vn/vjmech/article/view/2486.