Constructive Spectral and Numerical Range Theory. Havea, R. S. Ph.D. Thesis, Department of Mathematics & Statistics, University of Canterbury, Christchurch, 2001.
bibtex   
@PHDTHESIS{Hav01,
  author = {Havea, Robin Siale},
  title = {Constructive Spectral and Numerical Range Theory},
  school = {Department of Mathematics \& Statistics, University of Canterbury},
  year = {2001},
  address = {Christchurch},
  keywords = {bib,con}
}
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