TY  - JOUR
AU  - A. I. Vol'pert
TI  - On the index and normal solvability of boundary-value problems for elliptic systems of differential equations on the plane
JO  - Trudy Moskovskogo matematičeskogo obŝestva
PY  - 1961
SP  - 41
EP  - 87
VL  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MMO_1961_10_a1/
LA  - ru
ID  - MMO_1961_10_a1
ER  -