A. Kaufman and E. Shimony.
  <b>3D scan-conversion algorithms for voxel-based graphics </b>.
  In <i>Proceedings of 1986 Workshop on Interactive 3D Graphics</i>,
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  <A HREF="http://vis.cs.brown.edu/results/bibtex/Kaufman-1986-3SA.bib">(bibtex:
  Kaufman-1986-3SA)</A>.<br />