@TechReport{SCI:Par98b,
  author =    "S.G. Parker and P. Shirley and B. Smits",
  title =     "Single Sample Soft Shadows",
  number =    "UUCS-98-019",
  year =      "1998",
  institution = "University of Utah",
  type =      "School of Computing Technical Report",
  month =     "October",
  keywords =  "parallel visualization, interactive rt distributed
              interactive ray tracing dirt, scientific
              visualization, rtrt",
}