1. Albrecht, E., Vasilescu, F.-H.: Semi-Fredholm complexes; Operator Theory: Adv. Appl. 11 (1983), 15–39.
2. ALbrecht, E.: Spectral interpolation; Operator Theory: Adv. Appl. 14 (1984), 13–37.
3. Albrecht, E., Schindler, K.: Spectra of Operators on Real Interpolation Spaces; preprint (1989).
4. Barnes, B., Murphy, G., Smyth, M., West, T.: Riesz and Fredholm theory in Banach algebras; Res. Notes Math. 67 (1982).
5. Barnes, B.: Interpolation of Spectrum of Bounded Operators on Lebesgue Spaces; Rocky Mountain J. Math. 20:2 (1990), 359–378.