%0 Journal Article
%A R. S. Ismagilov
%A V. V. Martynov
%T A criterion for the discreteness of the spectrum of a selfadjoint system of differential equations of the first order with slowly varying coefficients
%J Doklady Akademii Nauk
%D 1966
%P 1223-1225
%V 167
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1966_167_6_a2/
%G ru
%F DAN_1966_167_6_a2