1. Aiena, P.: Fredholm and Local Spectral Theory with Applications to Multipliers. Kluwer, Dordrecht (2004)
2. Aluthge, A., Wang, D.: An operator inequality which implies paranormality. Math. Inequal. Appl. 7, 113–119 (1999)
3. Apostol, C., Fialkow, L.A., Herrero, D.A., Voiculescu, D.: Approximation of Hilbert space operators. In: Research Notes in Mathematics 102, vol. II. Pitman Advanced Publishing Program, London (1984)
4. Burlando, L.: Continuity of spectrum and spectral radius in algebras of operators. Ann. des faculté des Sci. de Toulouse
$$5^e$$
5
e
série 1(9), 5–54 (1988)
5. Bayart, F., Matheron, E.: Hyponormal operators, weighted shifts and weak forms of supercyclicity. Proc. Edinb. Math. Soc. 49, 1–15 (2006)