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Differential OperatorsContinuous SpectrumPartial DerivativeSchrodinger OperatorPeriodic CoefficientsElementary SubgroupInvariant SubspacesFree BoundaryDifferential OperatorDifferential EquationsComplex PlaneEntire FunctionSelfadjoint OperatorsBoundary Value ProblemError EstimatesFunctions of Exponential TypeDiscrete SpectrumOperator NormSelfadjoint OperatorSpectral Parameter