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@article{10_4064_cm_22_1_91_110, author = {J. R. Retherford}, title = {Schauder bases and best approximation}, journal = {Colloquium Mathematicum}, pages = {91--110}, publisher = {mathdoc}, volume = {22}, number = {1}, year = {1970}, doi = {10.4064/cm-22-1-91-110}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-22-1-91-110/} }
J. R. Retherford. Schauder bases and best approximation. Colloquium Mathematicum, Tome 22 (1970) no. 1, pp. 91-110. doi : 10.4064/cm-22-1-91-110. http://geodesic.mathdoc.fr/articles/10.4064/cm-22-1-91-110/
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