G. A. Cavagna.
  <b>Force platforms as ergometers</b>.
  <i>J. Appl. Physiol.</i>, 39:174-179, 1975.
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Cavagna-1975-FPE.bib">(bibtex:
  Cavagna-1975-FPE)</A>.<br />