Joseph LaViola, Daniel Keefe, Robert Zeleznik, and Daniel Acevedo.
  <b>Case Studies in Building Custom Input Devices for Virtual
  Environment Interaction</b>.
  In <i>VR 2004 Workshop: Beyond Glove and Wand Based Interaction</i>,
  Chicago, IL, March 2004.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/g/LaViola-2004-CSB.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/LaViola-2004-CSB.bib">(bibtex:
  LaViola-2004-CSB)</A>.<br />