Kien, Nguyen Dinh. “Vibration Frequency of Prestress Slender Beams Resting on Winkler Elastic Foundation”. <i>Vietnam Journal of Mechanics</i> 28, no. 4 (December 31, 2006): 241–251. Accessed January 2, 2026. https://vjs.ac.vn/vjmech/article/view/5583.