TY  - JOUR
AU  - V. M. Eni
TI  - Stability of the root-number of an analytic operator-function and on perturbations of its characteristic numbers and eigenvectors
JO  - Doklady Akademii Nauk
PY  - 1967
SP  - 1251
EP  - 1254
VL  - 173
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1967_173_6_a4/
LA  - ru
ID  - DAN_1967_173_6_a4
ER  -