EVTUKHOV, V. M.; SHLEPAKOV, O. R. Asymptotic representations of solutions of essentially nonlinear systems of ordinary differential equations with regularly and rapidly varying nonlinearities. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 64, n. 9, p. 1165–1185, 2012. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2650. Acesso em: 14 apr. 2025.