Daniel Keefe, Daniel Acevedo, Jadrian Miles, Fritz Drury, Sharon Swartz, and
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  <i>IEEE Transactions on Visualization and Computer Graphics</i>,
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  <A HREF="http://vis.cs.brown.edu/docs/pdf/g/Keefe-2008-SSF.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Keefe-2008-SSF.bib">(bibtex:
  Keefe-2008-SSF)</A>.<br />