Michael Kirby, H. Marmanis, and David H. Laidlaw.
  <b>Visualizing Multivalued Data from 2D Incompressible Flows
  Using Concepts from Painting</b>.
  In <i>Proceedings of IEEE Visualization 1999</i>, pages 333-340,
  1999.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/g/Kirby-1999-VMD.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Kirby-1999-VMD.bib">(bibtex:
  Kirby-1999-VMD)</A>.<br />