Romanyuk, A.S. (2017) “Oleksandr Ivanovych Stepanets’ (on his 75th birthday)”, Ukrains’kyi Matematychnyi Zhurnal, 69(5), p. 579. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1718 (Accessed: 5 December 2025).