DINH, N. V. The cubic non-linearity of order ε in the second approximation. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 21, n. 4, p. 203–212, 1999. DOI: 10.15625/0866-7136/10002. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/10002. Acesso em: 20 apr. 2024.