%0 Journal Article
%A V. P. Il'in
%T Approximation of functions in the spaces $\widetilde{W}_p^{(l)}(D)$ and $W_p^{(l)}(D)$ by continuously differentiable functions
%J Doklady Akademii Nauk
%D 1961
%P 1283-1286
%V 137
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1961_137_6_a6/
%G ru
%F DAN_1961_137_6_a6