Raimund Dachselt and Anett Hubner.
 <b>Three-dimensional menus: A survey and taxonomy</b>.
 <em>Computers and Graphics</em>, 2006.
 In Press
  <a href="http://vis.cs.brown.edu/docs/pdf/bib/g/Dachselt-2006-TMS.pdf.html">(pdf)</a>
  <a href="http://vis.cs.brown.edu/results/bibtex/Dachselt-2006-TMS.bib">(bibtex:
  Dachselt-2006-TMS)</a>.