TY  - JOUR
AU  - V. Ya. Ivrii
TI  - The wave fronts of the solutions of the system that describes crystal optics
JO  - Doklady Akademii Nauk
PY  - 1977
SP  - 763
EP  - 765
VL  - 232
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1977_232_4_a7/
LA  - ru
ID  - DAN_1977_232_4_a7
ER  -