EVTUKHOV, V. M.; KAS'YANOVA, V. A. Asymptotic Behavior of Unbounded Solutions of Essentially Nonlinear Second-Order Differential Equations. I. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 3, p. 338–355, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3602. Acesso em: 6 dec. 2025.