Mitropolskiy YA. On the 90th Anniversary of the Birth of Academician N.N. Bogolyubov. Ukr. Mat. Zhurn. [Internet]. 1999Aug.25 [cited 2024May9];51(8):1012–1013. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4692