L.R. Frank.
  <b>Anisotropy in high angular resolution diffusion-weighted
  MRI</b>.
  <i>Magnetic Resonance in Medicine</i>, 45(6):935-939, 2001.
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Frank-2001-AHA.bib">(bibtex:
  Frank-2001-AHA)</A>.<br />