1.Thom TT, Kien ND. Free vibration of two-directional FGM beams using a higher-order Timoshenko beam element. Vietnam J. Sci. Technol. [Internet]. 2018 Jun. 11 [cited 2026 Jan. 10];56(3):380-96. Available from: https://vjs.ac.vn/jst/article/view/10754