@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/