EVTUKHOV, V. M.; KAS'YANOVA, V. A. Asymptotic behavior of unbounded solutions of essentially nonlinear second-order differential equations. II. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 7, p. 901–921, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3505. Acesso em: 6 dec. 2025.