%0 Journal Article
%A N. A. Zboychik
%T Quadratic integrals of linear systems of differential equations
%J Differencialʹnye uravneniâ
%D 1970
%P 381-384
%V 6
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1970_6_2_a19/
%G ru
%F DE_1970_6_2_a19