TY  - JOUR
AU  - D. Kh. Safarov
TI  - Systems of first-order partial differential equations of composite type
JO  - Differencialʹnye uravneniâ
PY  - 1985
SP  - 272
EP  - 276
VL  - 21
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1985_21_2_a10/
LA  - ru
ID  - DE_1985_21_2_a10
ER  -