NGUYEN VAN DAO. Investigation of motion stability in a critical case by the asymptotic method of non-linear mechanics . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 4, p. 545–552, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8591. Acesso em: 6 dec. 2025.