Thinh, Tran Ich, and Ngo Nhu Khoa. “A New Finite Element for Free Vibration Analysis of Stiffened Composite Plates”. Vietnam Journal of Mechanics 29, no. 4 (December 31, 2007): 529–538. Accessed April 20, 2024. https://vjs.ac.vn/index.php/vjmech/article/view/5603.