%0 Journal Article
%A V. I. Burenkov
%T On the approximation of functions in $C^r(\Omega)$ where $\Omega$ is an arbitrary open set
%J Doklady Akademii Nauk
%D 1972
%P 16-18
%V 202
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1972_202_1_a2/
%G ru
%F DAN_1972_202_1_a2