%0 Journal Article
%A P. V. Paramonov
%T Criteria for $C^1$-approximability of functions on compact sets in~${\mathbb{R}}^N$, $N\geqslant 3$, by solutions of~second-order homogeneous elliptic equations
%J Izvestiya. Mathematics 
%D 2021
%P 483-505
%V 85
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_2021_85_3_a9/
%G en
%F IM2_2021_85_3_a9