%0 Journal Article
%A L. B. Zelenko
%T Deficiency index and spectrum of a selfadjoint system of first-order differential equations
%J Doklady Akademii Nauk
%D 1968
%P 278-281
%V 181
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1968_181_2_a4/
%G ru
%F DAN_1968_181_2_a4