Geodesic
The density of infinitely differentiable functions in Sobolev spaces for an arbitrary open set
Informatics and Automation, 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{TRSPY_1974_131_a4,
     author = {V. I. Burenkov},
     title = {The density of infinitely differentiable functions in {Sobolev} spaces for an arbitrary open set},
     journal = {Informatics and Automation},
     pages = {39--50},
     publisher = {mathdoc},
     volume = {131},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1974_131_a4/}
}
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%T The density of infinitely differentiable functions in Sobolev spaces for an arbitrary open set
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V. I. Burenkov. The density of infinitely differentiable functions in Sobolev spaces for an arbitrary open set. Informatics and Automation, 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/TRSPY_1974_131_a4/