TY  - JOUR
AU  - M. A. Grinfel'd
TI  - On the theory of ray method of the wave front investigation in nonlinear problems
JO  - Doklady Akademii Nauk
PY  - 1979
SP  - 337
EP  - 340
VL  - 247
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1979_247_2_a19/
LA  - ru
ID  - DAN_1979_247_2_a19
ER  -