VIET, L. D.; NGHI, N. B. Approximated analytical frequency response of a pendulum structure attached with two orthogonal dynamic vibration absorbers. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 37, n. 4, p. 275–284, 2015. DOI: 10.15625/0866-7136/37/4/5920. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/5920. Acesso em: 29 may. 2022.