Mitropolskiy, Yu. A. “On the 90th Anniversary of the Birth of Academician N.N. Bogolyubov”. Ukrains’kyi Matematychnyi Zhurnal 51, no. 8 (August 25, 1999): 1012–1013. Accessed May 9, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4692.