@article{1077491919,
author = {Offord, A. C.},
title = {Approximation to functions by trigonometric polynomials},
journal = {Duke Math. J.},
volume = {6},
number = {1},
year = {1940},
pages = { 505-510},
language = {en},
url = {http://dml.mathdoc.fr/item/1077491919}
}
Offord, A. C. Approximation to functions by trigonometric polynomials. Duke Math. J., Tome 6 (1940) no. 1, pp. 505-510. http://gdmltest.u-ga.fr/item/1077491919/