%0 Journal Article
%A N. Yu. Kapustin
%T Solvability in the class $L_2$ of the characteristic problem
%J Doklady Akademii Nauk
%D 1990
%P 784-788
%V 311
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1990_311_4_a2/
%G ru
%F DAN_1990_311_4_a2