Mark Friedell, Jane Barnett, and David Kramlich.
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  <i>Computer Graphics</i>, 16(3):181-188, July 1982.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Friedell-1982-CSG.pdf.html">(pdf)</A> <A HREF="http://vis.cs.brown.edu/results/bibtex/Friedell-1982-CSG.bib">(bibtex:
  Friedell-1982-CSG)</A>.<br />