@article{1077467334,
author = {Jewett, John},
title = {Differentiable approximations to interior functions},
journal = {Duke Math. J.},
volume = {24},
number = {1},
year = {1957},
pages = { 227-232},
language = {en},
url = {http://dml.mathdoc.fr/item/1077467334}
}
Jewett, John. Differentiable approximations to interior functions. Duke Math. J., Tome 24 (1957) no. 1, pp. 227-232. http://gdmltest.u-ga.fr/item/1077467334/