TY  - JOUR
AU  - N. N. Ural'tseva
TI  - General second-order quasi-linear equations and certain classes of systems of equations of elliptic type
JO  - Doklady Akademii Nauk
PY  - 1962
SP  - 778
EP  - 781
VL  - 146
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1962_146_4_a10/
LA  - ru
ID  - DAN_1962_146_4_a10
ER  -