%0 Journal Article
%A Z. O. Mel'nik
%T Hyperbolic equations with multiple characteristics
%J Differencialʹnye uravneniâ
%D 1974
%P 1530-1532
%V 10
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1974_10_8_a22/
%G ru
%F DE_1974_10_8_a22