Geodesic
Stability of the root-number of an analytic operator-function and on perturbations of its characteristic numbers and eigenvectors
Doklady Akademii Nauk, Tome 173 (1967) no. 6, pp. 1251-1254.

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     author = {V. M. Eni},
     title = {Stability of the root-number of an analytic operator-function and on perturbations of its characteristic numbers and eigenvectors},
     journal = {Doklady Akademii Nauk},
     pages = {1251--1254},
     publisher = {mathdoc},
     volume = {173},
     number = {6},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_173_6_a4/}
}
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V. M. Eni. Stability of the root-number of an analytic operator-function and on perturbations of its characteristic numbers and eigenvectors. Doklady Akademii Nauk, Tome 173 (1967) no. 6, pp. 1251-1254. http://geodesic.mathdoc.fr/item/DAN_1967_173_6_a4/