@Article{SCI:Nel2006a,
  author =    "B. Nelson and R.M. Kirby",
  title =     "Ray-Tracing Polymorphic Multi-Domain Spectral/hp
              Elements for Isosurface Rendering",
  journal =   "IEEE Transactions on Visualization and Computer
              Graphics",
  volume =    "12",
  number =    "1",
  pages =     "114--125",
  year =      "2006",
  url =       "http://www.sci.utah.edu/publications/nelson06/Nelson_VCG06.pdf",
}