A. C. Callan-Jones, Robert A. Pelcovits, Vadim Slavin, Song Zhang, David H.
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  <A HREF="http://vis.cs.brown.edu/docs/pdf/g/Callan-2006-SVT.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Callan-2006-SVT.bib">(bibtex:
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