G.J. Stanisz, A. Szafer, G.A. Wright, and R.M. Henkelman.
  <b>An analytical model of restricted diffusion in bovine optic
  nerve</b>.
  <i>Magn Reson Med</i>, 37(1):103-11, 1997.
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Stanisz-1997-AMR.bib">(bibtex:
  Stanisz-1997-AMR)</A>.<br />