EVTUKHOV, V. M.; KOZ'MA, A. A. Existence criteria and asymptotics for some classes of solutions of essentially nonlinear second-order differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 7, p. 924–938, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2775. Acesso em: 5 dec. 2025.