A. Stompel, E. B. Lum, and K.-L. Ma.
  <b>Visualization of Multidimensional, Multivariate Volume Data
  Using Hardware-Accelerated Non-Photorealistic Rendering Techniques</b>.
  In <i>10 th Pacific Conference on Computer Graphics and
  Applications (PG'02)</i>, page 394, 2002.
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Stompel-2002-VMM.bib">(bibtex:
  Stompel-2002-VMM)</A>.<br />