Rick Buxton.
  <b>Figures for Diffusion and the MR Signal</b>, 2002.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Buxton-2002-FIG.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Buxton-2002-FIG.bib">(bibtex:
  Buxton-2002-FIG)</A>.<br />