ROMANYUK, A. S.; ROMANYUK, V. S.; SAVCHUK, V. V.; SAMOILENKO, A. M.; SERDYUK, A. S.; SOKOLENKO, I. V. Oleksandr Ivanovych Stepanets’ (on his 75th birthday). Ukrains’kyi Matematychnyi Zhurnal, v. 69, n. 5, p. 579, 25 May 2017.