TY  - JOUR
AU  - N. A. Ëltysheva
TI  - On qualitative properties of solutions of some hyperbolic systems on the plane
JO  - Sbornik. Mathematics
PY  - 1989
SP  - 181
EP  - 203
VL  - 63
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1989_63_1_a12/
LA  - en
ID  - SM_1989_63_1_a12
ER  -