C.R.G. Guttmann, F.A. Jolesz, R. Kikinis, R.J. Killiany, M.B. Moss, T. Sandor,
  and M.S. Albert.
  <b>White matter changes with normal aging</b>.
  <i>Neurology</i>, 50(4):972-978, April 1998.
  <A HREF="http://vis.cs.brown.edu/docs/html/bib/g/Guttmann-1998-WMC.html.html">(html)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Guttmann-1998-WMC.bib">(bibtex:
  Guttmann-1998-WMC)</A>.<br />