DINH, N. V. The Van der Pol’s system under external and parametric excitations. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 19, n. 1, p. 27–33, 1997. DOI: 10.15625/0866-7136/10045. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/10045. Acesso em: 20 apr. 2024.