%0 Journal Article
%A G. V. Virabyan
%T Spectral properties of operators generated by systems of differential equations of higher order and of Sobolev type
%J Doklady Akademii Nauk
%D 1963
%P 13-16
%V 150
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1963_150_1_a1/
%G ru
%F DAN_1963_150_1_a1