TY  - JOUR
AU  - M. A. Grinfel'd
TI  - On the linear theory of head wave
JO  - Doklady Akademii Nauk
PY  - 1980
SP  - 1109
EP  - 1111
VL  - 250
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1980_250_5_a21/
LA  - ru
ID  - DAN_1980_250_5_a21
ER  -