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R. E. Harte and W. Y. Lee, Another note on Weyl's theorem, Trans. Amer. Math. Soc. 349 (1997), no. 5, 2115-2124.
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R. E. Harte and A. W. Wickstead, Boundaries, hulls and spectral mapping theorems, Proc. Roy. Irish Acad. Sect. A 81 (1981), no. 2, 201-208.
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H. Heuser, Functional Analysis, Wiley Interscience, Chichester, 1982.
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J. J. Koliha, A generalized Drazin inverse, Glasgow Math. J. 38 (1996), no. 3, 367-381.
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V. Muller, Spectral Theory of Linear Operators and Spectral Systems in Banach Algebras, Birkhauser 2007.
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V. Rakocevic, Essential spectrum in Banach algebras, Doctoral dissertation, Nis 1983.
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V. Rakocevic, Approximate point spectrum and commuting compact perturbations, Glasgow Math. J. 28 (1986), no. 2, 193-198.
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V. Rakocevic, Generalized spectrum and commuting compact perturbations, Proc. Edinburgh Math. Soc. (2) 36 (1993), no. 2, 197-209.
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V. Rakocevic, Semi Browder operators and perturbations, Studia Math. 122 (1996), 131-137.
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M. Schechter and R. Whitley, Best Fredholm perturbation theorems, Studia Math., 90 (1988), no. 3, 175-190.
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S. Zivkovic, Semi-Fredholm operators and perturbations, Inst. Math. (Beograd) (N.S.) 61(75) (1997), 73-89.
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R.E. Harte, Invertibility and Singularity, Dekker 1988.
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J. J. Buoni, R. E. Harte, and T. Wickstead, Upper and lower Fredholm spectra. I, Proc. Amer. Math. Soc. 66 (1977), no. 2, 309-314.
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B. P. Duggal, Perturbations of operators satisfying a local growth condition, Extracta Math. 23 (2008), no. 1, 29-42.
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R.E. Harte, Spectral mapping theorems, Proc. Royal Irish Acad. Sect. A 72 (1972), 89-107.
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R.E. Harte, On Kato non-singularity, Studia Math. 117 (1996), no. 2, 107-114.
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R. E. Harte and A.-H. Kim, Weyl's theorem, tensor products and multiplication operators, J. Math. Anal. Appl. 336 (2007), no. 2, 1124-1131.
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