Benharrat, Mohammed, Kouider Miloud Hocine, and Bekkai Messirdi. “Left and Right Generalized Drazin Invertible Operators and Local Spectral Theory”. Proyecciones (Antofagasta, On line) 38, no. 5 (December 15, 2019): 897-919. Accessed April 25, 2024. https://www.revistaproyecciones.cl/index.php/proyecciones/article/view/2957.