BICH, D. H.; BICH, N. D. Parametric conditions and exact solution for the Duffing-Van der Pol class of equations. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 40, n. 3, p. 251–264, 2018. DOI: 10.15625/0866-7136/11085. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/11085. Acesso em: 29 mar. 2024.