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Perturbation theory for linear operators. (English) Zbl 0148.12601
Grundlehren der mathematischen Wissenschaften. Band 132. Berlin-Heidelberg-New York: Springer-Verlag. xx, 592 p. with 3 figures DM 79.20 (1966).

47A55 Perturbation theory of linear operators
47-02 Research exposition (monographs, survey articles) pertaining to operator theory
46Cxx Inner product spaces and their generalizations, Hilbert spaces