CAN, L. X. On quasiperiodic oscillations of a nonlinear dynamic system of Liapunov type with time lag. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 20, n. 1, p. 1–8, 1998. DOI: 10.15625/0866-7136/10007. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/10007. Acesso em: 28 mar. 2024.