TY  - JOUR
AU  - N. A. Shirokov
TI  - Constructive descriptions of classes of functions with the help of polynomial approximations. I
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 1998
SP  - 207
EP  - 234
VL  - 254
UR  - http://geodesic.mathdoc.fr/item/ZNSL_1998_254_a12/
LA  - ru
ID  - ZNSL_1998_254_a12
ER  -