Dung, Dao Van, and Le Kha Hoa. 2012. “Solving Nonlinear Stability Problem of Imperfect Functionally Graded Circular Cylindrical Shells under Axial Compression by Galerkin’s Method”. Vietnam Journal of Mechanics 34 (3). Hanoi, Vietnam:139-56. https://doi.org/10.15625/0866-7136/34/3/2356.