TY  - JOUR
AU  - R. R. Akopyan
TI  - Best approximation of the differentiation operator on the class of functions analytic in a~strip
JO  - Trudy Instituta matematiki i mehaniki
PY  - 2014
SP  - 9
EP  - 16
VL  - 20
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TIMM_2014_20_1_a1/
LA  - ru
ID  - TIMM_2014_20_1_a1
ER  -