TY  - JOUR
AU  - B. A. Vostretsov
AU  - A. V. Ignat'eva
TI  - The existence in the $L_p$ metric of the best approximation of functions by sums of a finite number of plane waves of given directions
JO  - Doklady Akademii Nauk
PY  - 1967
SP  - 1225
EP  - 1228
VL  - 176
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1967_176_6_a3/
LA  - ru
ID  - DAN_1967_176_6_a3
ER  -