@TECHREPORT{S.Callahan2004,
  author = {S. Callahan, M. Ikits, J. Comba, and C. Silva},
  title = {Hardware-Assisted Visibility Sorting for Unstructured Volume Rendering},
  institution = {SCI Institute Technical Report UUSCI-2004-003. University Of Utah},
  year = {2004},
  owner = {comba},
  timestamp = {2011.05.13}
}