George W. Fitzmaurice, Hiroshi Ishii, and William Buxton.
  <b>Bricks: Laying the Foundations for Graspable User
  Interfaces</b>.
  In <i>Proceedings of CHI</i>. ACM Press, May 1995.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Fitzmaurice-1995-BLF.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Fitzmaurice-1995-BLF.bib">(bibtex: Fitzmaurice-1995-BLF)</A>.<br />