TY  - JOUR
AU  - G.G. LORENTZ
TI  - The Degree of Approximation by Polynomiala with Positive Coefficients.
JO  - Mathematische Annalen
PY  - 1963
SP  - 239
EP  - 251
VL  - 151
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1963__151_161079/
ID  - MAN_1963__151_161079
ER  -