1. Fredholm and Local Spectral Theory with Applications to Multipliers;Aiena,2004
2. The Weyl spectrum of an operator;Berberian;Indiana Univ. Math. J.,1970
3. Weyl’s theorem for nonnormal operators;Coburn;Michigan Math. J.,1966
4. Theory of Generalized Spectral Operators;Colojoara,1968
5. A Course in Functional Analysis;Conway,1990