Robert S. Macleod, Christopher R. Johnson, and Mike A. Matheson.
  <b>Visualizing Bioelectric Fields</b>.
  <i>Computer Graphics and Applications</i>, 13(4):10-12, July/August
  1993.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Macleod-1993-VBF.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Macleod-1993-VBF.bib">(bibtex:
  Macleod-1993-VBF)</A>.<br />