Eni Halilaj, David H. Laidlaw, Douglas Moore, and jcrisco.
 <b>Polar Histograms of Curvature for Quantifying Skeletal Joint
  Shape and Congruence </b>.
 <em>Journal of Biomechanical Engineering</em>, pages 136(9), 094503,
  2014.
 published
  <a href="http://vis.cs.brown.edu/docs/pdf/g/Halilaj-2014-JBE.pdf.html">(pdf)</a>
  <a href="http://vis.cs.brown.edu/results/bibtex/Halilaj-2014-JBE.bib">(bibtex:
  Halilaj-2014-JBE)</a>.