Liqiang Huang, Anne Treisman, and Harold Pashler.
  <b>Characterizing the Limits of Human Visual Awareness</b>.
  <i>Science</i>, 317:823-825, August 2007.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Huang-2007-CLH.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Huang-2007-CLH.bib">(bibtex:
  Huang-2007-CLH)</A>.<br />