Stephen Owen, David Budgen, and Pearl Brereton.
 <b>Protocol Analysis: A Neglected Practice</b>.
 <em>Communications of the ACM</em>, 49(2):117--122, February 2006.
  <a href="http://vis.cs.brown.edu/docs/pdf/bib/g/Owen-2006-PAN.pdf.html">(pdf)</a>
  <a href="http://vis.cs.brown.edu/results/bibtex/Owen-2006-PAN.bib">(bibtex:
  Owen-2006-PAN)</a>.