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On a characterization of the essential spectra of some matrix operators and application to two-group transport operatorsSalma Charfi; Aref Jeribi · 2009
On a characterization of the S-essential spectra of the sum and the product of two operators and application to a transport operatorCHARFI, Salma; RAHALI, Sassia · Acta Mathematica Scientia · 2015