%0 Journal Article
%T Tyshkevich Regina Iosifovna
%J Journal of the Belarusian State University. Mathematics and Informatics
%D 2020
%P 84-85
%V 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/BGUMI_2020_1_a11/
%G ru
%F BGUMI_2020_1_a11