“On the Solution of the Nonlinear Periodic Boundary-Value Problem With Switchings in the Case of Parametric Resonance by the Newton – Kantorovich Method”. Neliniini Kolyvannya 26, no. 2 (June 29, 2023): 294–308. Accessed April 11, 2026. https://nosc.imath.kiev.ua/index.php/nosc/article/view/1105.