DINH, Nguyen Van. A modified asymptotic method for a Van-der-Pol oscillator with large cubic restoring nonlinearity. <b>Vietnam Journal of Mechanics</b>, Hanoi, Vietnam, v. 26, n. 2, p. 122–128, 2004. DOI: 10.15625/0866-7136/26/2/5696. Disponível em: https://vjmech.vast.vn/vjmech/article/view/5696. Acesso em: 9 nov. 2025.