TY  - JOUR
TI  - Letter to the editors
JO  - Journal of the Belarusian State University. Mathematics and Informatics
PY  - 2019
SP  - 33
EP  - 34
VL  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/BGUMI_2019_1_a4/
LA  - ru
ID  - BGUMI_2019_1_a4
ER  -