Christopher G. Healey, Victoria Interrante, davidkremers, David H. Laidlaw, and
  Penny Rheingans.
  <b>Nonphotorealistic Rendering in Scientific Visualization</b>.
  In <i>Course Notes of SIGGRAPH 2001</i>, volume Course 32, August
  2001.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/g/Healey-2001-NRS.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Healey-2001-NRS.bib">(bibtex:
  Healey-2001-NRS)</A>.<br />