V. M. Evtukhov and V. A. Kas'yanova, “Asymptotic behavior of unbounded solutions of essentially nonlinear second-order differential equations. II”, Ukr. Mat. Zhurn., vol. 58, no. 7, pp. 901–921, Jul. 2006, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3505