@article{GDZPPN002291983,
title = {The Degree of Approximation by Polynomiala with Positive Coefficients.},
journal = {Mathematische Annalen},
volume = {152},
year = {1963},
pages = {239-251},
zbl = {0116.04602},
url = {http://dml.mathdoc.fr/item/GDZPPN002291983}
}
LORENTZ, G.G. The Degree of Approximation by Polynomiala with Positive Coefficients.. Mathematische Annalen, Tome 152 (1963) pp. 239-251. http://gdmltest.u-ga.fr/item/GDZPPN002291983/