Dowson, H.R.
Spectral theory of linear operators
Academic Press, 1978
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Kubrusly, Carlos S.
Spectral theory of operators on hilbert spaces
Springer, 2012
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Dunford, Nelson
Linear operators part 2: spectral theory, self adjoint operators in Hilbert space
John Wiley & Sons, 1963
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Dunford, Nelson
Linear operators part III : spectral operators
John Wiley & Sons, 1971
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Coddington, Earl A.
Theory of ordinary differential equations
Tata Mcgraw-Hill, 1982
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