TY  - JOUR
AU  - A. I. Vol'pert
TI  - The index of systems of two-dimensional singular integral equations
JO  - Doklady Akademii Nauk
PY  - 1962
SP  - 776
EP  - 777
VL  - 142
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1962_142_4_a7/
LA  - ru
ID  - DAN_1962_142_4_a7
ER  -