TY  - JOUR
AU  - V. V. Arestov
AU  - R. R. Akopyan
TI  - Stechkin's problem on the best approximation of an unbounded operator by bounded ones and related problems
JO  - Trudy Instituta matematiki i mehaniki
PY  - 2020
SP  - 7
EP  - 31
VL  - 26
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TIMM_2020_26_4_a0/
LA  - ru
ID  - TIMM_2020_26_4_a0
ER  -