@Proceedings{volvis2004-proc,
  author = {Silver, D. and Ertl, T. and Silva, C.},
  title  = {{Proceedings of the IEEE/SIGGRAPH Symposium on Volume Visualization 2004}},
  year   = {2004},
  editor={Silver, D. and Ertl, T. and Silva, C.},
  publisher={IEEE Computer Society Press}
}