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Samoilenko , A. M.; Klesov , O. I.; Zaderei, P. V.; Nefedova , G. D.; Zaderei , N. M.; Gaidei , V. O. Nina Opanasivna Virchenko (on His 90th Birthday). Ukr. Mat. Zhurn. 2020, 72 (8), 1149-1152. https://doi.org/10.37863/umzh.v72i8.6213.