%0 Journal Article
%A Ya. A. Roitberg
%A Z. G. Sheftel
%T Green’s formula and homeomorphism theorems for nonlocal elliptic boundary value problems
%J Doklady Akademii Nauk
%D 1971
%P 1059-1062
%V 201
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_201_5_a12/
%G ru
%F DAN_1971_201_5_a12