@InProceedings{SCI:Bav2007a,
  author =    "L. Bavoil and S.P. Callahan and A. Lefohn and
              J.L.D. Comba and C.T. Silva",
  title =     "Multi-Fragment Effects on the GPU using the
              k-Buffer",
  booktitle = "{ACM} Symposium on Interactive {3D} Graphics and
              Games (i3D)",
  pages =     "97--104",
  year =      "2007",
  keywords =  "volume rendering",
  url =       "http://www.sci.utah.edu/publications/bavoil07/kbuffer_preprint.pdf",
}