@article{GDZPPN00234887X,
title = {A Closure Problem for Spaces of Infinitely Differentiable Functions.},
journal = {Mathematica Scandinavica},
volume = {20},
year = {1967},
pages = {209-224},
zbl = {0197.38902},
url = {http://dml.mathdoc.fr/item/GDZPPN00234887X}
}
Wahde, Gösta. A Closure Problem for Spaces of Infinitely Differentiable Functions.. Mathematica Scandinavica, Tome 20 (1967) pp. 209-224. http://gdmltest.u-ga.fr/item/GDZPPN00234887X/