@article{1183502561,
author = {Walsh, J. L. and Sewell, W. E.},
title = {Note on degree of trigonometric and polynomial approximation to an analytic function, in the sense of least $p$th powers},
journal = {Bull. Amer. Math. Soc.},
volume = {46},
number = {11},
year = {1940},
pages = { 312-319},
language = {en},
url = {http://dml.mathdoc.fr/item/1183502561}
}
Walsh, J. L.; Sewell, W. E. Note on degree of trigonometric and polynomial approximation to an analytic function, in the sense of least $p$th powers. Bull. Amer. Math. Soc., Tome 46 (1940) no. 11, pp. 312-319. http://gdmltest.u-ga.fr/item/1183502561/