TY  - JOUR
AU  - Boulbeba Abdelmoumen
AU  - Sadok Chakroun
AU  - Mnif Maher
TI  - Perturbation results in the Fredholm theory and m-essential spectra of some matrix operators
JO  - Filomat
PY  - 2021
SP  - 2141 
VL  - 35
IS  - 7
UR  - http://geodesic.mathdoc.fr/articles/10.2298/FIL2107141A/
DO  - 10.2298/FIL2107141A
LA  - en
ID  - 10_2298_FIL2107141A
ER  -