Geodesic
Linear Difference and Differential Operators with Unbounded Operator Coefficients in Weight Spaces
Matematičeskie zametki, Tome 86 (2009) no. 5, pp. 673-680

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We describe the spectrum of linear difference and differential operators with unbounded operator coefficients in weight spaces.
Keywords: linear difference operator, linear differential operator, weight space, complex Banach space, evolution operator, spectrum of an operator, Beurling–Gelfand formula. 
@article{MZM_2009_86_5_a3,
     author = {M. S. Bichegkuev},
     title = {Linear {Difference} and {Differential} {Operators} with {Unbounded} {Operator} {Coefficients} in {Weight} {Spaces}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {673--680},
     publisher = {mathdoc},
     volume = {86},
     number = {5},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_86_5_a3/}
}
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M. S. Bichegkuev. Linear Difference and Differential Operators with Unbounded Operator Coefficients in Weight Spaces. Matematičeskie zametki, Tome 86 (2009) no. 5, pp. 673-680. http://geodesic.mathdoc.fr/item/MZM_2009_86_5_a3/