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  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/ODonnell-2006-HWM.pdf.html">(pdf)</A> <A HREF="http://vis.cs.brown.edu/results/bibtex/ODonnell-2006-HWM.bib">(bibtex:
  ODonnell-2006-HWM)</A>.<br />