DINH, Nguyen Van; CHI, Tran Kim. A system of Van der Pol type under nonlinear parametric excitation. <b>Vietnam Journal of Mechanics</b>, Hanoi, Vietnam, v. 19, n. 4, p. 21–28, 1997. DOI: 10.15625/0866-7136/10064. Disponível em: https://vjmech.vast.vn/vjmech/article/view/10064. Acesso em: 9 nov. 2025.