%0 Journal Article
%A O. N. Naida
%A A. G. Prudkovskii
%T The WKB method for the system $(-{}ih\partial /\partial t+{\cal A}(x,t,-{}ih\partial /\partial x))U=0$ in the case of characteristics of variable multiplicity
%J Differencialʹnye uravneniâ
%D 1977
%P 1678-1691
%V 13
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_9_a13/
%G ru
%F DE_1977_13_9_a13