%0 Journal Article
%A G.G. LORENTZ
%T The Degree of Approximation by Polynomiala with Positive Coefficients.
%J Mathematische Annalen
%D 1963
%P 239-251
%V 151
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1963__151_161079/
%F MAN_1963__151_161079