Latrach, Khalid; Dehici, Abdelkader Fredholm, semi-Fredholm perturbations, and essential spectra. (English) Zbl 1029.47007 J. Math. Anal. Appl. 259, No. 1, 277-301 (2001). MSC: 47A53 47A10 47A55 47N20 PDFBibTeX XMLCite \textit{K. Latrach} and \textit{A. Dehici}, J. Math. Anal. Appl. 259, No. 1, 277--301 (2001; Zbl 1029.47007) Full Text: DOI Link
Latrach, Khalid; Dehici, Abdelkader Relatively strictly singular perturbations, essential spectra, and application to transport operators. (English) Zbl 0976.47008 J. Math. Anal. Appl. 252, No. 2, 767-789 (2000). Reviewer: Takashi Ichinose (Kanazawa) MSC: 47A53 47A11 47A55 PDFBibTeX XMLCite \textit{K. Latrach} and \textit{A. Dehici}, J. Math. Anal. Appl. 252, No. 2, 767--789 (2000; Zbl 0976.47008) Full Text: DOI Link