%0 Journal Article
%A A. I. Perov
%T New complete solvability conditions and questions of reducibility
%J Doklady Akademii Nauk
%D 1969
%P 26-29
%V 186
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_186_1_a5/
%G ru
%F DAN_1969_186_1_a5