TY  - JOUR
AU  - Yu. V. Egorov
AU  - V. A. Kondrat'ev
TI  - On the negative spectrum of an elliptic operator
JO  - Informatics and Automation
PY  - 1990
SP  - 61
EP  - 67
VL  - 192
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1990_192_a5/
LA  - ru
ID  - TRSPY_1990_192_a5
ER  -