TY  - JOUR
AU  - R. R. Akopyan
TI  - Best approximation of differentiation operators on the Sobolev class of functions analytic in a strip
JO  - Sibirskie èlektronnye matematičeskie izvestiâ
PY  - 2021
SP  - 1286
EP  - 1298
VL  - 18
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SEMR_2021_18_2_a70/
LA  - ru
ID  - SEMR_2021_18_2_a70
ER  -