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Dedicated toGottfried Köthe on his 60th birthday, December 25, 1965
This research was supported by the Office of Naval Research.
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Dunford, N. A spectral theory for certain operators on a direct sum of Hilbert spaces. Math. Ann. 162, 294–330 (1966). https://doi.org/10.1007/BF01369105
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DOI: https://doi.org/10.1007/BF01369105