TY  - JOUR
AU  - A. A. Melikyan
TI  - Singular characteristics of first-order partial differential
JO  - Doklady Akademii Nauk
PY  - 1996
SP  - 24
EP  - 28
VL  - 351
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1996_351_1_a6/
LA  - ru
ID  - DAN_1996_351_1_a6
ER  -