TY  - JOUR
AU  - V. A. Il'in
TI  - Some questions in the spectral theory of elliptic operators
JO  - Matematičeskie zametki
PY  - 1972
SP  - 489
EP  - 499
VL  - 12
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1972_12_4_a15/
LA  - ru
ID  - MZM_1972_12_4_a15
ER  -