@Article{SCI:Yan2011a,
  author =    "C. Yang and D. Xiu and R.M. Kirby",
  title =     "Visualization of Covariance and Cross-covariance
              Field",
  journal =   "International Journal for Uncertainty
              Quantification",
  volume =    "3",
  number =    "1",
  pages =     "25--38",
  year =      "2011",
  doi =      
              "10.1615/Int.J.UncertaintyQuantification.2011003369",
  keywords =  "netl",
  url =       "http://www.sci.utah.edu/publications/yang11/Yang_IJUQ2011.pdf",
}