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The major portion of this note was written while the author was on Sabbatical leave from the University of Illinois and a visitor at the University of California, Berkeley. The author is indebted to both of these institutions and to the National Science Foundation which partially supported him under Grant 19869.
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Bartle, R.G. Spectral localization of operators in Banach spaces. Math. Ann. 153, 261–269 (1964). https://doi.org/10.1007/BF01362416
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DOI: https://doi.org/10.1007/BF01362416