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[1] A. J. Hoffman, H. W. Wielandt, The variation of the spectrum of a normal matrix, Duke Math. J., 20 (1953) , 37-39. [2] W. Kahan, Spectra of nearly hermitian matrices, Proc. Amer. Math. Soc., 48 (1975) , 11-17. [3] G. W. Stewart, A note on non-Hermitian perturlations of Hermitian matrices, CNA-41, AD-745006, 1972. |
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