TY  - JOUR
AU  - I. A. Grigor'eva
TI  - A generalization of Bernstein’s theorem on the form of nonnegative trigonometric polynomials to the case of 

JO  - Doklady Akademii Nauk
PY  - 1962
SP  - 283
EP  - 286
VL  - 147
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1962_147_2_a3/
LA  - ru
ID  - DAN_1962_147_2_a3
ER  -