%0 Journal Article %A A. R. Mirotin %T Letter to the editors %J Journal of the Belarusian State University. Mathematics and Informatics %D 2020 %P 92 %V 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/BGUMI_2020_3_a9/ %G en %F BGUMI_2020_3_a9