%0 Journal Article
%A S. G. Krein
%T On correctness classes for certain boundary problems
%J Doklady Akademii Nauk
%D 1957
%P 1162-1165
%V 114
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_114_6_a6/
%G ru
%F DAN_1957_114_6_a6