V. M. Evtukhov and A. A. Koz'ma, “Existence criteria and asymptotics for some classes of solutions of essentially nonlinear second-order differential equations”, Ukr. Mat. Zhurn., vol. 63, no. 7, pp. 924–938, Jul. 2011, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2775