Lindner, MarkoMarkoLindner1286425480000-0001-8483-2944Schmidt, TorgeTorgeSchmidt2020-04-222020-04-222017Verlag Dr. Hut: (2017)http://hdl.handle.net/11420/5814enMathematikApproximation of spectra and pseudospectra on a Hilbert spaceDoctoral ThesisIske, ArminArminIskeOther