Sharon Swartz, David H. Laidlaw, and Kenneth Breuer.
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  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Swartz-2007-BWS.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Swartz-2007-BWS.bib">(bibtex:
  Swartz-2007-BWS)</A>.<br />