Michael S. Landy and James R. Bergen.
  <b>Texture Segregation and Orientation Gradient</b>.
  <i>Vision Research</i>, 31(4):679-691, 1991.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Landy-1991-TSO.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Landy-1991-TSO.bib">(bibtex:
  Landy-1991-TSO)</A>.<br />