%0 Journal Article
%A I. Birindelli
%A E. Mitidieri
%A G. Sweers
%T Existence of the principal eigenvalue for cooperative elliptic systems in a general domain
%J Differencialʹnye uravneniâ
%D 1999
%P 325-333
%V 35
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1999_35_3_a6/
%G ru
%F DE_1999_35_3_a6