Evtukhov, V. M., and Korepanova Е. S. “Asymptotic Representation of Solutions of Differential Equations With Rightly Varying Nonlinearities”. Ukrains’kyi Matematychnyi Zhurnal 69, no. 9 (September 25, 2017): 1198–1216. Accessed December 6, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/1770.