TY  - JOUR
AU  - T. V. Iofina
TI  - On the Order of Approximation by Riesz Means in Multiplicative Systems in the Classes~$E_X[\varepsilon]$
JO  - Matematičeskie zametki
PY  - 2011
SP  - 508
EP  - 523
VL  - 89
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_2011_89_4_a3/
LA  - ru
ID  - MZM_2011_89_4_a3
ER  -