HAI, N. Q. Analysis of some nonlinear deterministic oscillators using extended averaged equation approach. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 27, n. 1, p. 32–40, 2005. DOI: 10.15625/0866-7136/27/1/5712. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/5712. Acesso em: 25 apr. 2024.