Myroslav L’vovych Horbachuk (on his 70th birthday) - Adamyan, V. M.; Berezansky, Yu. M.; Kochubei, A. N.; Kuzhel', S. A.; Marchenko, V. O.; Mikhailets, V. A.; Nizhnik, L. P.; Ptashnik, B. I.; Rofe-Beketov, F. S.; Samoilenko, A. M.; Samoilenko, Yu. S.; Khruslov, E. Ya. (Ukrains’kyi Matematychnyi Zhurnal, 2008)