NIH.
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  Unpublished
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/NIH-2004-DTI.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/NIH-2004-DTI.bib">(bibtex:
  NIH-2004-DTI)</A>.<br />