PERSIDSKII, S. K. On the Exponential Stability of Some Nonlinear Systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 1, p. 131–136, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3580. Acesso em: 5 dec. 2025.