TY  - JOUR
AU  - A. V. Marchenko
TI  - On~the index of boundary value problems for degenerate elliptic operators
JO  - Sbornik. Mathematics
PY  - 1972
SP  - 615
EP  - 634
VL  - 16
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1972_16_4_a6/
LA  - en
ID  - SM_1972_16_4_a6
ER  -