Samoilenko, A. M. “Life and Work of N. N. Bogolyubov (on His 100th Birthday)”. Ukrains’kyi Matematychnyi Zhurnal 61, no. 8 (August 25, 2009): 1130-1141. Accessed April 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3085.