MathSciNet bibliographic data MR417841 47B20 Campbell, Stephen L.; Gellar, Ralph Spectral properties of linear operators for which \$T\sp*T\$$T\sp*T$ and \$T\$$T$ \$+\$$+$ \$T\sp*\$$T\sp*$ commute. Proc. Amer. Math. Soc. 60 (1976), 197–202 (1977). Article

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