Marco DaSilva, Song Zhang, Cagatay Demiralp, and David H. Laidlaw.
  <b>Visualizing the Differences between Diffusion Tensor Volume
  Images</b>.
  In <i>Proceedings ISMRM Workshop in Diffusion MRI: Biophysical
  Issues</i>, pages 237-238, March 2002.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/g/DaSilva-2002-VDD.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/DaSilva-2002-VDD.bib">(bibtex:
  DaSilva-2002-VDD)</A>.<br />