DAO, Nguyen Van; DINH, Nguyen Van; CHI, Tran Kim. Van der Pol’s oscillator under the parametric and forced excitations. <b>Vietnam Journal of Mechanics</b>, Hanoi, Vietnam, v. 29, n. 3, p. 207–219, 2007. DOI: 10.15625/0866-7136/29/3/5533. Disponível em: https://vjmech.vast.vn/vjmech/article/view/5533. Acesso em: 8 nov. 2025.