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APA Citation
Jeribi, A., Krichen, B., & Zitouni, A. (2020). properties of Demicompact Operators, Essential Spectra and Some Perturbation Results for Block Operator Matrices with Applications. Linear & multilinear algebra, 68(12), 2506–2522. http://access.bl.uk/ark:/81055/vdc_100113595187.0x000047