%0 Journal Article %T Mikalaj Viktaravich Lazakovich %J Journal of the Belarusian State University. Mathematics and Informatics %D 2018 %P 111-112 %V 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/BGUMI_2018_1_a14/ %G ru %F BGUMI_2018_1_a14