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
eBooks
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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Chatelin, Francoise
Spectral approximation of linear operators : computer science and applied mathematics
Academic Press, 1983
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