Bich, Dao Huy, Nguyen Xuan Nguyen, and Hoang Van Tung. 2013. “Postbuckling of Functionally Graded Cylindrical Shells Based on Improved Donnell Equations”. Vietnam Journal of Mechanics 35 (1). Hanoi, Vietnam:1-15. https://doi.org/10.15625/0866-7136/35/1/2894.