Zaitsev, G. F. “CONTRIBUTION OF ACADEMICIAN OF THE AS UkrSSR A. I. KUKHTENKO AND HIS SCHOOLS INTO THE THEORY OF INVARIANCE”. Problems of Informatization and Control 2, no. 11 (November 17, 2021): 29–32. Accessed June 14, 2026. http://jrnl.kai.edu.ua/index.php/PIU/article/view/15913.