%0 Journal Article
%A I. V. Maiorov
%T An extremum principle for a degenerate hyperbolic system
%J Differencialʹnye uravneniâ
%D 1983
%P 532-535
%V 19
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1983_19_3_a21/
%G ru
%F DE_1983_19_3_a21