Dobrovol’skiiV. A., LykovaO. B., MitropolskiyYu. A., PustovoytovM. O., SamoilenkoA. M., and UrbanskyV. M. “Olexiy Bogolyubov (03.25.1911 - 01.11.2004)”. Ukrains’kyi Matematychnyi Zhurnal 58, no. 4 (April 25, 2006): 564–567. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3474.