Bihun, Yaroslav, and Ihor Skutar. “About Averaging in Hyperbolic Equation under the Influence of Multifrequence Disturbances”. Modeling, Control and Information Technologies: Proceedings of International scientific and practical conference, no. 3 (November 6, 2019): 9–10. Accessed May 2, 2024. https://itconfdoc.nuwm.edu.ua/index.php/ITConf/article/view/85.