@Article{SCI:Sic2014a,
  author =    "R. Sicat and J. Krüger and T. Möller and M.
              Hadwiger",
  title =     "Sparse {PDF} Volumes for Consistent
              Multi-Resolution Volume Rendering",
  journal =   "{IEEE} Transactions on Visualization and Computer
              Graphics ({TVCG})",
  volume =    "PP",
  number =    "99",
  pages =     "1--1",
  year =      "2014",
  isbn =      "1077-2626",
  url =       "http://www.sci.utah.edu/publications/Sic2014a/Sicat_TVCG2014.pdf",
}