Geodesic
Approximation of functions in the spaces $\widetilde{W}_p^{(l)}(D)$ and $W_p^{(l)}(D)$ by continuously differentiable functions
Doklady Akademii Nauk, Tome 137 (1961) no. 6, pp. 1283-1286.

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     author = {V. P. Il'in},
     title = {Approximation of functions in the spaces $\widetilde{W}_p^{(l)}(D)$ and $W_p^{(l)}(D)$ by continuously differentiable functions},
     journal = {Doklady Akademii Nauk},
     pages = {1283--1286},
     publisher = {mathdoc},
     volume = {137},
     number = {6},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_137_6_a6/}
}
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V. P. Il'in. Approximation of functions in the spaces $\widetilde{W}_p^{(l)}(D)$ and $W_p^{(l)}(D)$ by continuously differentiable functions. Doklady Akademii Nauk, Tome 137 (1961) no. 6, pp. 1283-1286. http://geodesic.mathdoc.fr/item/DAN_1961_137_6_a6/