BICH, N. D.; THONG, N. V. Methods for stability and instability of the solution of one non-linear differential equation. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 18, n. 3, p. 1–7, 1996. DOI: 10.15625/0866-7136/10099. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/10099. Acesso em: 30 apr. 2024.