DAO, Nguyen Van. Nonlinear oscillators under delay control. <b>Vietnam Journal of Mechanics</b>, Hanoi, Vietnam, v. 21, n. 2, p. 75–88, 2000. DOI: 10.15625/0866-7136/9989. Disponível em: https://vjmech.vast.vn/vjmech/article/view/9989. Acesso em: 9 nov. 2025.