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A Characterization of the Essential Spectra of $$2\times 2$$ Block Matrices of Linear Relations

Crossref DOI link: https://doi.org/10.1007/s41980-021-00653-0

Published Online: 2021-11-11

Published Print: 2022-10

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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