@TechReport{SCI:Ma93b,
  author =    "K.L. Ma and J.S. Painter and C.D. Hansen and M.F.
              Krogh",
  title =     "A Data Distributed Parallel Algorithm for
              Ray-Traced Volume Rendering",
  pages =     "15--22",
  year =      "1993",
  institution = "Institute for Computer Applications in Science
              and Engineering, {NASA} Langley Research Center",
  type =      "{ICASE} Report",
  month =     "August",
  location =  "Hampton, VA",
  keywords =  "volume rendering, parallel visualization,
              interactive rt distributed interactive ray tracing
              dirt",
}