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References:
[1] P. R. Halmos: Commutativity and spectral properties of normal operators. Acta Sci. Szeged 12(1950), 153-156. MR 0034516 | Zbl 0035.35805
[2] B. E. Johnson: Continuity of linear operators commuting with continuous linear operators. Trans. Am. Math. Soc. 128 (1967), 88-102. DOI 10.1090/S0002-9947-1967-0213894-5 | MR 0213894 | Zbl 0158.14405
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