TY  - JOUR
AU  - S. Baizaev
AU  - È. Muhamadiev
TI  - On the index of first-order elliptic operators in the plane
JO  - Differencialʹnye uravneniâ
PY  - 1992
SP  - 818
EP  - 827
VL  - 28
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1992_28_5_a9/
LA  - ru
ID  - DE_1992_28_5_a9
ER  -