%0 Journal Article
%A Ya. A. Roitberg
%T Isomorphism theorems and elliptic problems with potentials
%J Doklady Akademii Nauk
%D 1973
%P 33-36
%V 210
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1973_210_1_a7/
%G ru
%F DAN_1973_210_1_a7