Jon Christensen, Joe Marks, and Stuart Shieber.
  <i><b>Placing Text Labels on Maps and Diagrams</b></i>, chapter&nbsp;1.
  Academic Press, 1993.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Christensen-1993-PTL.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Christensen-1993-PTL.bib">(bibtex: Christensen-1993-PTL)</A>.<br />