Julian Besag.
  <b>On the statisical analysis of dirty pictures</b>.
  <i>Journal of the Royal Statistical Society B</i>, 48:259-302, 1986.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Besag-1986-OSA.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Besag-1986-OSA.bib">(bibtex:
  Besag-1986-OSA)</A>.<br />