Andrew Hanson and P. Heng.
  <b>Illuminating the Fourth Dimension</b>.
  <i>IEEE Computer Graphics and Applications</i>, 1992.
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Hanson-1992-IFD.bib">(bibtex:
  Hanson-1992-IFD)</A>.<br />