Myroslav L’vovych Horbachuk (on his 75 th birthday) - Berezansky, Yu. M.; Gerasimenko, V. I.; Kochubei, A. N.; Mikhailets, V. A.; Nizhnik, L. P.; Samoilenko, A. M.; Samoilenko, Yu. S.; Khruslov, E. Ya. (Ukrains’kyi Matematychnyi Zhurnal, 2013)