TY  - JOUR
AU  - A. P. Oskolkov
TI  - Prior estimates of the first derivatives for two-dimensional quasi-linear strongly elliptic systems
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1966
SP  - 192
EP  - 202
VL  - 92
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TM_1966_92_a12/
LA  - ru
ID  - TM_1966_92_a12
ER  -