TY  - JOUR
AU  - E. G. Zelkin
TI  - Systems of two second order differential equations and partial differential equations of elliptic type
JO  - Differencialʹnye uravneniâ
PY  - 1983
SP  - 700
EP  - 703
VL  - 19
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1983_19_4_a22/
LA  - ru
ID  - DE_1983_19_4_a22
ER  -