Integral Equations and Operator Theory · 2013 · 27 citations · 8 references
Natural SciencesMathematicsPhysicsDynamical SystemsSpectroscopyOperator TheoryPerturbation MethodsPerturbation TheorySingular Perturbation TheorySpectral AnalysisSpectral TheoryDiscrete SpectrumNon-self-adjoint OperatorsNon-self-adjoint SpectraPerturbation Theory Of OperatorsSelf-adjoint OperatorsSpectral ApproximationSturm - Liouville Theory
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Introduction to the Theory of Linear Non-selfadjoint Operators
Israel Gohberg · Medical Entomology and Zoology · 1969 · 1.5K citations
Tosio Kato · Communications in Mathematical Physics · 1987 · 60 citations
Spectra of nearly Hermitian matrices
W. Kahan · Proceedings of the American Mathematical Society · 1975 · 56 citations