TY  - JOUR
AU  - V. A. Bolgov
AU  - A. V. Efimov
TI  - On the rate of summability of orthogonal series
JO  - Izvestiya. Mathematics 
PY  - 1971
SP  - 1399
EP  - 1417
VL  - 5
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1971_5_6_a10/
LA  - en
ID  - IM2_1971_5_6_a10
ER  -