1. On a characterization of the essential spectra of the sum and the product of two operators;Abdmouleh;J. Math. Anal. Appl.,2012
2. Gustafson, Weidmann, Kato, Wolf, Schechter, Browder, Rakočević and Schmoger essential spectra of the sum of two bounded operators;Abdmouleh;Math. Nachr.,2011
3. Riesz operators and perturbation ideals;Aiena;Note Mat.,1989
4. Linear Operators and their Spectra;Davies,2007
5. Linear Operators;Dunford,1958