TY  - JOUR
AU  - A. Dzhuraev
TI  - Systems of second order partial differential equations of composite type with one double family of real characteristics
JO  - Doklady Akademii Nauk
PY  - 1969
SP  - 761
EP  - 764
VL  - 186
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1969_186_4_a5/
LA  - ru
ID  - DAN_1969_186_4_a5
ER  -