Geodesic
On an analytic perturbation theory for nonselfadjoint operators
Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Kazanskii Gosudarstvennyi Universitet. Uchenye Zapiski. Seriya Fiziko-Matematichaskie Nauki, Tome 148 (2006) no. 2, pp. 144-150 
A. M. Sidorov. On an analytic perturbation theory for nonselfadjoint operators. Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Kazanskii Gosudarstvennyi Universitet. Uchenye Zapiski. Seriya Fiziko-Matematichaskie Nauki, Tome 148 (2006) no. 2, pp. 144-150. http://geodesic.mathdoc.fr/item/UZKU_2006_148_2_a13/
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

In this paper we consider the conditions which imply an analytic dependence of the spectral objects of the perturbed nonselfadjoint operators in a Hilbert space on a perturbation parameter.

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