TY  - JOUR
AU  - B. M. Levitan
TI  - Asymptotic behaviour of the spectral function of an elliptic equat
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1971
SP  - 165
EP  - 232
VL  - 26
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1971_26_6_a4/
LA  - en
ID  - RM_1971_26_6_a4
ER  -