ZadereiP. V., LukovskyI. O., MakarovV. L., MitropolskiyY. A., RomanyukA. S., RomanyukV. S., RukasovV. I., SamoilenkoA. M., SerdyukA. S., & ShevchukI. A. (2002). Oleksandr Ivanovych Stepanets’ (on his 60-th birthday). Ukrains’kyi Matematychnyi Zhurnal, 54(5), 579-580. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4096