@Article{SCI:Sil2005a,
  author =    "C.T. Silva and J.L.D. Comba and S.P. Callahan and
              F.F. Bernardon",
  title =     "A Survey of GPU-Based Volume Rendering of
              Unstructured Grids",
  journal =   "Revista de Informatica Teorica e Aplicada",
  volume =    "12",
  number =    "2",
  pages =     "9--29",
  year =      "2005",
  issn =      "01034308",
  keywords =  "volume rendering",
  url =       "http://www.sci.utah.edu/publications/csilva2005/gputet_survey.pdf",
}