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. 
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/
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     title = {Linear {Difference} and {Differential} {Operators} with {Unbounded} {Operator} {Coefficients} in {Weight} {Spaces}},
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     pages = {673--680},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_86_5_a3/}
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