GorbachukM.L., LukovskyI.O., MarchenkoV.O., MitropolskiyY.A., PasturL.A., SamoilenkoA.M., SkrypnikI.V. and KhruslovE.Y. 2004. Dmytro Yakovych Petryna (on his 70 th birthday). Ukrains’kyi Matematychnyi Zhurnal. 56, 3 (Mar. 2004), 291-292.