Geodesic
On the approximation of functions in $C^r(\Omega)$ where $\Omega$ is an arbitrary open set
Doklady Akademii Nauk, Tome 202 (1972) no. 1, pp. 16-18 
V. I. Burenkov. On the approximation of functions in $C^r(\Omega)$ where $\Omega$ is an arbitrary open set. Doklady Akademii Nauk, Tome 202 (1972) no. 1, pp. 16-18. http://geodesic.mathdoc.fr/item/DAN_1972_202_1_a2/
@article{DAN_1972_202_1_a2,
     author = {V. I. Burenkov},
     title = {On the approximation of functions in $C^r(\Omega)$ where $\Omega$ is an arbitrary open set},
     journal = {Doklady Akademii Nauk},
     pages = {16--18},
     year = {1972},
     volume = {202},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_202_1_a2/}
}
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