%0 Journal Article %T Erovenko Valerii Aleksandrovich %J Journal of the Belarusian State University. Mathematics and Informatics %D 2020 %P 82-83 %V 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/BGUMI_2020_1_a10/ %G ru %F BGUMI_2020_1_a10