@Unpublished{SCI:Joh2006b,
  author =    "C.R. Johnson and R. Moorhead and T. Munzner and H.
              Pfister and P. Rheingans and T. S. Yoo",
  title =     "N{IH}-{NSF} {V}isualization {R}esearch
              {C}hallenges {R}eport",
  year =      "2006",
  publisher = "IEEE Press",
  note =      "http://tab.computer.org/vgtc/vrc/index.html",
  isbn =      "0-7695-2733-7",
  keywords =  "scalar field methods, volume rendering, vector
              field methods, tensor field methods, remote
              visualization, parallel visualization, popular",
  url =       "http://www.sci.utah.edu/publications/crj06/NIH-NSF-VRC-Report-Final.pdf",
}