KoshlyakovV.N., MitropolskiyY.A., SamoilenkoA.M. and UrbanskyV.M. 2001. Oleksii Mykolajovych Boholyubov (on His 90th Birthday). Ukrains’kyi Matematychnyi Zhurnal. 53, 3 (Mar. 2001), 294-295.