TY  - JOUR
AU  - O. N. Naida
AU  - A. G. Prudkovskii
TI  - 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
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 1678
EP  - 1691
VL  - 13
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_9_a13/
LA  - ru
ID  - DE_1977_13_9_a13
ER  -