OgulB. “On the Application of the Averaging Method to One Problem of Optimal Control With Unfixed Time”. Ukrains’kyi Matematychnyi Zhurnal 76, no. 10 (October 31, 2024): 1497 - 1504. Accessed November 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/8606.