TRU, Vu Quoc; BICH, Nguyen Dang. On the instability of a mechanical system of 2-degree of freedom taking into account the resisting force. <b>Vietnam Journal of Mechanics</b>, Hanoi, Vietnam, v. 19, n. 4, p. 73–78, 1997. DOI: 10.15625/0866-7136/10070. Disponível em: https://vjmech.vast.vn/vjmech/article/view/10070. Acesso em: 8 nov. 2025.