V. Interrante, H. Fuchs, and S. M. Pizer.
  <b>Conveying Shape of Smoothly Curving Transparent Surfaces via
  Texture</b>.
  <i>IEEE Transactions on Visualization and Computer Graphics</i>,
  3(2):98-117, 1997.
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Interrante-1997-CSS.bib">(bibtex:
  Interrante-1997-CSS)</A>.<br />