Khoa, Nguyen Viet, and Nguyen Van Quang. “Free Vibration of a Cracked Double-Beam Carrying a Concentrated Mass”. <i>Vietnam Journal of Mechanics</i> 38, no. 4 (December 20, 2016): 279–293. Accessed January 1, 2026. https://vjs.ac.vn/vjmech/article/view/7118.