DINH, N. V. Stability of the equilibrium regime of a system of two degrees of freedom in amplitude-phase variables. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 17, n. 1, p. 28–34, 1995. DOI: 10.15625/0866-7136/10121. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/10121. Acesso em: 24 apr. 2024.