@InProceedings{SCI:She94c,
  author =    "H.W. Shen and C.R. Johnson",
  title =     "Differential volume rendering: A fast alogrithm
              for scalar field animation",
  booktitle = "Visualization 94",
  pages =     "180--187",
  year =      "1994",
  publisher = "{IEEE} Press",
  keywords =  "computational pde pdes computational partial
              differential equations evaporation, scalar field
              methods, volume rendering",
  url =       "http://www.sci.utah.edu/publications/shen94/vis94_7.ps",
  url =       "http://www.sci.utah.edu/publications/shen94/vis94_7.ps.Z",
}