DINH, N. V. Weak self-sustained system under the actions of less weak excitations. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 16, n. 3, p. 5–10, 1994. DOI: 10.15625/0866-7136/10168. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/10168. Acesso em: 25 may. 2022.