Ich, Le Cong, Nguyen Van Chinh, Tran Van Binh, and Nguyen Dinh Kien. “Free Vibration of Bidirectional Functionally Graded Sandwich Beams Partially Resting on Pasternak Foundation Based on a Sinusoidal Theory”. <i>Vietnam Journal of Science and Technology</i> 58, no. 5 (October 16, 2020): 635–649. Accessed January 8, 2026. https://vjs.ac.vn/jst/article/view/15052.