Korobov, V. I., and T. V. Andriienko. “Construction of Controllability Function As Time of Motion”. *Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics* 97 (June 8, 2023): 13-24. Accessed July 23, 2024. https://periodicals.karazin.ua/mech_math/article/view/21695.