D.J. Werring, C.A. Clark, G.J. Barker, D.H. Miller, G.J.M. Parker, M.J.
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  <A HREF="http://vis.cs.brown.edu/results/bibtex/Werring-1998-SFM.bib">(bibtex:
  Werring-1998-SFM)</A>.<br />