Evtukhov, V. M., and A. G. Chernikova. “On the Asymptotic of Solutions of Second-Order Differential Equations With Rapidly Varying Nonlinearities”.
Ukrains’kyi Matematychnyi Zhurnal 71, no. 1 (January 25, 2019): 73–91. Accessed April 11, 2025.
https://umj.imath.kiev.ua/index.php/umj/article/view/1420.