TY  - JOUR
AU  - V. Ya. Ivrii
TI  - Wave fronts of solutions of some hyperbolic equations and conical refraction
JO  - Doklady Akademii Nauk
PY  - 1976
SP  - 1257
EP  - 1259
VL  - 226
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1976_226_6_a3/
LA  - ru
ID  - DAN_1976_226_6_a3
ER  -