DINH, Nguyen Van. Stability of a parametrically - excited system under two excitations. <b>Vietnam Journal of Mechanics</b>, Hanoi, Vietnam, v. 15, n. 2, p. 27–31, 1993. DOI: 10.15625/0866-7136/10199. Disponível em: https://vjmech.vast.vn/vjmech/article/view/10199. Acesso em: 8 nov. 2025.