@TechReport{SCI:Bav2006a,
  author =    "L. Bavoil and S.P. Callahan and C.T. Silva",
  title =     "Robust Soft Shadow Mapping with Depth Peeling",
  number =    "UUSCI-2006-028",
  year =      "2006",
  institution = "University of Utah",
  type =      "{SCI} Institute Technical Report",
  keywords =  "volume rendering",
  url =       "http://www.sci.utah.edu/publications/SCITechReports/UUSCI-2006-028.pdf",
}