Christopher G. Filippi, Aziz M. Ulug, Elizabeth Ryan, Steven J. Ferrando, and
  Wilfred van Gorp.
  <b>Diffusion Tensor Imaging of Patients with HIV and
  Normal-appearing White Matter on MR Images of the Brain</b>.
  <i>American Journal of Neuroradiology</i>, 22:277-283, February 2001.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Filippi-2001-DTI.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Filippi-2001-DTI.bib">(bibtex:
  Filippi-2001-DTI)</A>.<br />