Ich, Le Cong, Nguyen Van Chinh, Tran Van Binh, and Nguyen Dinh Kien. 2020. “Free Vibration of Bidirectional Functionally Graded Sandwich Beams Partially Resting on Pasternak Foundation Based on a Sinusoidal Theory”. Vietnam Journal of Science and Technology 58 (5). Hanoi, VN:635-49. https://doi.org/10.15625/2525-2518/58/5/15052.