Trevor M. O'Brien, Anna M. Ritz, Benjamin J. Raphael, and David H. Laidlaw.
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  <A HREF="http://vis.cs.brown.edu/docs/pdf/g/OBrien-2010-GIV.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/OBrien-2010-GIV.bib">(bibtex:
  OBrien-2010-GIV)</A>.<br />