DAO, N. V.; DINH, N. V.; CHI, T. K. Van der Pol’s oscillator under the parametric and forced excitations. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 29, n. 3, p. 207–219, 2007. DOI: 10.15625/0866-7136/29/3/5533. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/5533. Acesso em: 25 apr. 2024.