Feng Dong, Gordon J. Clapworthy, Hai Lin, and Meleagros A. Krokos.
  <b>Nonphotorealistic Rendering of Medical Volume Data</b>.
  <i>IEEE Computer Graphics and Applications</i>, 23(4):44-52, 2003.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/g/Dong-2003-NRM.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Dong-2003-NRM.bib">(bibtex:
  Dong-2003-NRM)</A>.<br />