TY  - JOUR
AU  - A. S. Romanyuk
TI  - Best approximations and widths of classes of periodic functions of several variables
JO  - Sbornik. Mathematics
PY  - 2008
SP  - 253
EP  - 275
VL  - 199
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_2008_199_2_a4/
LA  - en
ID  - SM_2008_199_2_a4
ER  -