Equality of essential spectra of quasisimilar operators with property (δ)
Glasgow mathematical journal, Tome 38 (1996) no. 1, pp. 21-28

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A Banach space operator has property (δ) if and only if it is the quotient of a decomposable operator, equivalently, if and only if its adjoint has Bishop's property (β). Within this class of operators, it is shown that quasisimilarity preserves essential spectra.
Miller, T. L.; Miller, V. G. Equality of essential spectra of quasisimilar operators with property (δ). Glasgow mathematical journal, Tome 38 (1996) no. 1, pp. 21-28. doi: 10.1017/S0017089500031219
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