Making Sense of Multivalued Matrix Functions with the Matrix Unwinding Function. Higham, N. J. March, 2014.
Making Sense of Multivalued Matrix Functions with the Matrix Unwinding Function [link]Paper  bibtex   
@misc{high14-unwinding,
  author =        {Nicholas J. Higham},
  url =
  {{https://nhigham.com/2014/03/24/making-sense-of-multivalued-matrix-functions}},
  month =         mar,
  title =         {Making Sense of Multivalued Matrix Functions with the
                   Matrix Unwinding Function},
  year =          {2014},
}

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