TY  - JOUR
AU  - P. P. Korovkin
TI  - An extermal problem and linear methods of summation of Fourier series
JO  - Doklady Akademii Nauk
PY  - 1967
SP  - 265
EP  - 267
VL  - 177
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1967_177_2_a3/
LA  - ru
ID  - DAN_1967_177_2_a3
ER  -