El amrani, Abdelkhalek, Aziz Blali, and Mohamed Amine Taybi. “Spectral Analysis for Finite Rank Perturbation of Diagonal Operator in Non-Archimedean Banach Space of Countable Type”. Proyecciones (Antofagasta, On line) 41, no. 5 (August 26, 2022): 1063-1074. Accessed February 3, 2023. https://www.revistaproyecciones.cl/index.php/proyecciones/article/view/4984.