Koval’chuk, T. V., V. I. Kravets, V. V. Mohyl’ova, and A. N. Stanzhitskii. “Application of the method of Averaging to the Problems of Optimal Control over Functional-Differential Equations”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 2 (February 25, 2018): 206-215. Accessed April 16, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1551.