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@article{MAN_1960__140_160770, author = {I. SINGER}, title = {On best {Approximation} of {Continuous} {Functions.}}, journal = {Mathematische Annalen}, pages = {165--168}, publisher = {mathdoc}, volume = {140}, year = {1960}, zbl = {0092.11601}, url = {http://geodesic.mathdoc.fr/item/MAN_1960__140_160770/} }
I. SINGER. On best Approximation of Continuous Functions.. Mathematische Annalen, Tome 140 (1960), pp. 165-168. http://geodesic.mathdoc.fr/item/MAN_1960__140_160770/