Evtukhov, V. M., and A. G. Chernikova. “Asymptotic Behavior of the Solutions of Second-order differential Equations With Rapidly Varying Nonlinearities”. Ukrains’kyi Matematychnyi Zhurnal 69, no. 10 (October 25, 2017): 1345-1363. Accessed April 18, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1786.