Seungyong Lee, George Wolberg, and Sung Yong Shin.
  <b>Scattered Data Interpolation with Multilevel B-Splines</b>.
  <i>IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS</i>,
  3(3):228-244, JULY SEPTEMBER 1997.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Lee-1997-SDI.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Lee-1997-SDI.bib">(bibtex:
  Lee-1997-SDI)</A>.<br />