TY  - JOUR
AU  - V. P. Shatskii
TI  - On hyperbolic systems with two planes of singularities
JO  - Doklady Akademii Nauk
PY  - 1978
SP  - 56
EP  - 59
VL  - 242
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1978_242_1_a12/
LA  - ru
ID  - DAN_1978_242_1_a12
ER  -