@article{1077492070,
author = {Walsh, J. L. and Sewell, W. E.},
title = {Sufficient conditions for various degrees of approximation by
polynomials},
journal = {Duke Math. J.},
volume = {6},
number = {1},
year = {1940},
pages = { 658-705},
language = {en},
url = {http://dml.mathdoc.fr/item/1077492070}
}
Walsh, J. L.; Sewell, W. E. Sufficient conditions for various degrees of approximation by
polynomials. Duke Math. J., Tome 6 (1940) no. 1, pp. 658-705. http://gdmltest.u-ga.fr/item/1077492070/