BICH, D. H.; HOA, L. K. Non-linear vibration of functionally graded shallow spherical shells. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 32, n. 4, p. 199–210, 2010. DOI: 10.15625/0866-7136/32/4/289. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/289. Acesso em: 27 apr. 2024.