GorbachukM.L., ZadereiP.V., LukovskyI.O., MakarovV.L., MotornyiV.P., RomanyukA.S., SamoilenkoA.M., SerdyukA.S. and SharkoV.V. 2012. Oleksandr Ivanovych Stepanets’ (on the 70 th anniversary of his birthday). Ukrains’kyi Matematychnyi Zhurnal. 64, 5 (May 2012), 579-581.