TY  - JOUR
AU  - S. B. Vakarchuk
AU  - V. I. Zabutnaya
TI  - A Sharp Inequality of Jackson--Stechkin type in~$L_2$ and the Widths of Functional Classes
JO  - Matematičeskie zametki
PY  - 2009
SP  - 328
EP  - 336
VL  - 86
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_2009_86_3_a1/
LA  - ru
ID  - MZM_2009_86_3_a1
ER  -