Tim Behrens.
  <i><b>MR Diffusion Tractography: Methods and Applications</b></i>.
  PhD thesis, University of Oxford, 2004.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Behrens-2004-MDT.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Behrens-2004-MDT.bib">(bibtex:
  Behrens-2004-MDT)</A>.<br />