%0 Journal Article
%A Boulbeba Abdelmoumen
%A Sadok Chakroun
%A Mnif Maher
%T Perturbation results in the Fredholm theory and m-essential spectra of some matrix operators
%J Filomat
%D 2021
%P 2141 
%V 35
%N 7
%U http://geodesic.mathdoc.fr/articles/10.2298/FIL2107141A/
%R 10.2298/FIL2107141A
%G en
%F 10_2298_FIL2107141A