Oleksandr Ivanovych Stepanets' (on his 60-th birthday)

Zaderei, P. V., I. O. Lukovsky, V. L. Makarov, Y. A. Mitropolskiy, A. S. Romanyuk, V. S. Romanyuk, V. I. Rukasov, A. M. Samoilenko, A. S. Serdyuk, and I. A. Shevchuk. “Oleksandr Ivanovych Stepanets’ (on His 60-th birthday)”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 54, no. 5, May 2002, pp. 579-80, https://umj.imath.kiev.ua/index.php/umj/article/view/4096.