C. Pierpaoli, A.S. Barnett, S. Pajevic, A. Virta, and P.J. Basser.
  <b>Validation of DT-MRI tractography in the descending motor
  pathways of human subjects</b>.
  In <i>International Society for Magnetic Resonance in Medicine
  (ISMRM)</i>, page 501, Glasgow, 2001.<br />