S. Lange, H. Schumann, W. Muller, and D. Kromker.
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  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Lange-1995-POV.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Lange-1995-POV.bib">(bibtex:
  Lange-1995-POV)</A>.<br />