Asymptotic behavior of solutions of cyclic nonlinear systems of ordinary differential equations. Neliniini Kolyvannya, [S. l.], v. 14, n. 3, p. 299–317, 2011. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/609. Acesso em: 12 apr. 2026.