Berezansky, Y.M., Korolyuk, V.S., Mitropolskiy, Y.A., Samoilenko, A.M. and Skrypnik, I.V. 2002. Mykola Ivanovych Shkil’ (On His 70th Birthday). Ukrains’kyi Matematychnyi Zhurnal. 54, 12 (Dec. 2002), 1589-1591.