TY  - JOUR
AU  - V. P. Il'in
TI  - Approximation of functions in the spaces $\widetilde{W}_p^{(l)}(D)$ and $W_p^{(l)}(D)$ by continuously differentiable functions
JO  - Doklady Akademii Nauk
PY  - 1961
SP  - 1283
EP  - 1286
VL  - 137
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1961_137_6_a6/
LA  - ru
ID  - DAN_1961_137_6_a6
ER  -