[1]
KoshlyakovV. N., MitropolskiyY. A., SamoilenkoA. M., and UrbanskyV. M., “Oleksii Mykolajovych Boholyubov (on His 90th Birthday)”, Ukr. Mat. Zhurn., vol. 53, no. 3, pp. 294-295, Mar. 2001.