TY  - JOUR
AU  - N. I. Popivanov
TI  - Boundary value problems for degenerate multidimensional hyperbolic equations
JO  - Differencialʹnye uravneniâ
PY  - 1975
SP  - 116
EP  - 126
VL  - 11
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1975_11_1_a13/
LA  - ru
ID  - DE_1975_11_1_a13
ER  -