DINH, Nguyen Van. Stationary oscillations in degenerated case. <b>Vietnam Journal of Mechanics</b>, Hanoi, Vietnam, v. 18, n. 2, p. 13–19, 1996. DOI: 10.15625/0866-7136/10094. Disponível em: https://vjmech.vast.vn/vjmech/article/view/10094. Acesso em: 8 nov. 2025.