%0 Journal Article
%A A. Halanay
%A Sh. Shandor
%T Sturm type theorems for self-conjugate systems of higher order differential equations
%J Doklady Akademii Nauk
%D 1957
%P 506-507
%V 114
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_114_3_a14/
%G ru
%F DAN_1957_114_3_a14