TY  - JOUR
AU  - A. B. Shvartsburg
TI  - Transition lines and singular points in nonlinear geometric optics equations
JO  - Doklady Akademii Nauk
PY  - 1971
SP  - 575
EP  - 578
VL  - 200
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1971_200_3_a18/
LA  - ru
ID  - DAN_1971_200_3_a18
ER  -