TY  - JOUR
AU  - O. G. Rovenskaya
TI  - An exact constant on the estimation of the approximation error of classes of differentiable functions by the second-order Cesaro means
JO  - Matematičeskie trudy
PY  - 2021
SP  - 150
EP  - 159
VL  - 24
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MT_2021_24_2_a8/
LA  - ru
ID  - MT_2021_24_2_a8
ER  -