References
Putnam, C. R.: On the spectra of semi-normal operators. Trans. Amer. Math. Soc.119, 509–523 (1965).
: Commutation properties of Hilbert space operators and related topics. Ergebnisse der Math.36, Berlin-Heidelberg-New York: Springer 1967.
Stampfli, J. G.: Hyponormal operators and spectral density. Trans. Amer. Math. Soc.117, 469–476 (1965).
Stampfli, J. G.: A study of the Dunford boundedness condition for certain classes of subnormal and hyponormal operators. Univ. of Mich., ONR, NR 043-319, May 1965.
—: Mimimal range theorems for operators with thin spectra. Pacific Jour. Math.23, 601–612 (1967).
Toshino, T.: Spectral resolution of a hyponormal operator with the spectrum on a curve. Tohoku Math. Jour.19, 86–97 (1967).
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This work was supported by a National Science Foundation research grant.
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Putnam, C.R. Hyponormal operators and low density spectra. Math Z 106, 167–169 (1968). https://doi.org/10.1007/BF01110125
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DOI: https://doi.org/10.1007/BF01110125