1. C. Clark, On relatively bounded perturbations of ordinary differential operators. Pac. J. Math. 25, 59–70 (1968)
2. N. Dunford, J.T. Schwartz, Linear Operators (Part III, Wiley-Interscience, New-York, 1971)
3. H. Ellouz, I. Feki, A. Jeribi, On the basis property of root vectors related to a non-self-adjoint analytic operator and applications (2020)
4. I. Feki, A. Jeribi, R. Sfaxi, On a Schauder basis related to the eigenvectors of a family of non-self-adjoint analytic operators and applications. Anal. Math. Phys. 3(4), 311–331 (2013)
5. A. Jeribi, Denseness, Bases and Frames in Banach Spaces and Applications (de Gruyter, Berlin, 2018)