Jos Stam.
  <b>A Simple Fluid Solver based on the FFT</b>.
  <i>Journal of Graphics Tools</i>, 6(2):43-52, 2001.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/g/Stam-2001-SFS.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Stam-2001-SFS.bib">(bibtex:
  Stam-2001-SFS)</A>.<br />