@article{1077469705,
author = {Jurkat, W. B. and Lorentz, G. G.},
title = {Uniform approximation by polynomials with positive
coefficients},
journal = {Duke Math. J.},
volume = {28},
number = {1},
year = {1961},
pages = { 463-473},
language = {en},
url = {http://dml.mathdoc.fr/item/1077469705}
}
Jurkat, W. B.; Lorentz, G. G. Uniform approximation by polynomials with positive
coefficients. Duke Math. J., Tome 28 (1961) no. 1, pp. 463-473. http://gdmltest.u-ga.fr/item/1077469705/