TY  - JOUR
AU  - N. P. Korneichuk
TI  - The exact value of best approximations and widths of certain classes of functions
JO  - Doklady Akademii Nauk
PY  - 1963
SP  - 1218
EP  - 1220
VL  - 150
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1963_150_6_a7/
LA  - ru
ID  - DAN_1963_150_6_a7
ER  -