Roberta L. Klatzky, Jack M. Loomis, Andrew C. Beall, Sarah S. Chance, and
  Reginald G. Golledge.
 <b>Spatial Updating of Self-Position and Orientation during
  Real, Imagined, and Virtual Locomotion</b>.
 <em>Psychological Science</em>, 9(4):293--298, July 1998.
  <a href="http://vis.cs.brown.edu/docs/pdf/bib/g/Klatzky-1998-SUO.pdf.html">(pdf)</a>
  <a href="http://vis.cs.brown.edu/results/bibtex/Klatzky-1998-SUO.bib">(bibtex:
  Klatzky-1998-SUO)</a>.