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@article{MS2_1967__20_165991, author = {G\"osta Wahde}, title = {A {Closure} {Problem} for {Spaces} of {Infinitely} {Differentiable} {Functions.}}, journal = {Mathematica Scandinavica}, pages = {209--224}, publisher = {mathdoc}, volume = {20}, year = {1967}, zbl = {0197.38902}, url = {http://geodesic.mathdoc.fr/item/MS2_1967__20_165991/} }
Gösta Wahde. A Closure Problem for Spaces of Infinitely Differentiable Functions.. Mathematica Scandinavica, Tome 20 (1967), pp. 209-224. http://geodesic.mathdoc.fr/item/MS2_1967__20_165991/