TINH, N. D. Higher order stochastic averaging method for mechanical systems having two degrees of freedom. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 26, n. 2, p. 103–110, 2004. DOI: 10.15625/0866-7136/26/2/5694. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/5694. Acesso em: 25 apr. 2024.