C. Herberhold, S. Faber, T. Stammberger, M. Steinlechner, R. Putz, K.H.
  Englmeier, M. Reiser, and F. Eckstein.
  <b>In situ measurement of articular cartilage deformation in
  intact femoropatellar joints under static loading</b>.
  <i>Journal of Biomechanincs</i>, 32:1287-1295, 1999.<br />