An Ninh, Vu Thi, Luu Quynh Huong, Tran Thanh Hai, and Nguyen Tien Khiem. “The Transfer Matrix Method for Modal Analysis of Cracked Multistep Beam”. <i>Vietnam Journal of Science and Technology</i> 55, no. 5 (October 20, 2017): 598–611. Accessed September 3, 2026. https://vjst.vast.vn/jst/article/view/9140.