Geodesic
On localization of the spectrum of non-self-adjoint differential operators
Fundamentalʹnaâ i prikladnaâ matematika, Tome 12 (2006) no. 5, pp. 11-19.

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In this paper, we consider the problem on the localization of the spectrum of non-self-adjoint differential operators on unbounded domains with power coefficients. For finding the location of spectrum points in the complex plane, we use isospectral deformations of differential operators and the properties of families of closed operators analytic in the Kato sense. 
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N. F. Valeev. On localization of the spectrum of non-self-adjoint differential operators. Fundamentalʹnaâ i prikladnaâ matematika, Tome 12 (2006) no. 5, pp. 11-19. http://geodesic.mathdoc.fr/item/FPM_2006_12_5_a1/

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