D. J. Werring, C. A. Clark, G. J. Parker, D. H. Miller, A. J. Thompson, and
  G. J. Barker.
  <b>A direct demonstration of both structure and function in the
  visual system: combining diffusion tensor imaging with functional magnetic
  resonance imaging</b>.
  <i>Neuroimage</i>, 9(3):352-361, March 1999.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Werring-1999-DDB.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Werring-1999-DDB.bib">(bibtex:
  Werring-1999-DDB)</A>.<br />