TY  - JOUR
AU  - A. F. Timan
AU  - V. N. Trofimov
TI  - Exact constants in some converse theorems for approximations by trigonometric polynomials
JO  - Matematičeskie zametki
PY  - 1976
SP  - 787
EP  - 792
VL  - 20
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1976_20_5_a20/
LA  - ru
ID  - MZM_1976_20_5_a20
ER  -