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@article{MAN_1963__151_161079, author = {G.G. LORENTZ}, title = {The {Degree} of {Approximation} by {Polynomiala} with {Positive} {Coefficients.}}, journal = {Mathematische Annalen}, pages = {239--251}, publisher = {mathdoc}, volume = {151}, year = {1963}, zbl = {0116.04602}, url = {http://geodesic.mathdoc.fr/item/MAN_1963__151_161079/} }
G.G. LORENTZ. The Degree of Approximation by Polynomiala with Positive Coefficients.. Mathematische Annalen, Tome 151 (1963), pp. 239-251. http://geodesic.mathdoc.fr/item/MAN_1963__151_161079/