Geodesic
The density of infinitely differentiable functions in Sobolev spaces for an arbitrary open set
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations in the theory of differentiable functions of many variables and its applications. Part V, Tome 131 (1974), pp. 39-50.

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@article{TM_1974_131_a4,
     author = {V. I. Burenkov},
     title = {The density of infinitely differentiable functions in {Sobolev} spaces for an arbitrary open set},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {39--50},
     publisher = {mathdoc},
     volume = {131},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1974_131_a4/}
}
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EP  - 50
VL  - 131
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%A V. I. Burenkov
%T The density of infinitely differentiable functions in Sobolev spaces for an arbitrary open set
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1974
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%F TM_1974_131_a4
V. I. Burenkov. The density of infinitely differentiable functions in Sobolev spaces for an arbitrary open set. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations in the theory of differentiable functions of many variables and its applications. Part V, Tome 131 (1974), pp. 39-50. http://geodesic.mathdoc.fr/item/TM_1974_131_a4/