TY  - JOUR
AU  - D. Kh. Safarov
TI  - Systems of second-order partial differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1984
SP  - 716
EP  - 719
VL  - 20
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1984_20_4_a21/
LA  - ru
ID  - DE_1984_20_4_a21
ER  -