@Article{SCI:Li2009a,
  author =    "J. Li and D. Xiu",
  title =     "A Generalized Polynomial Chaos Based Ensemble
              Kalman Filter with High Accuracy",
  journal =   "Journal of Computational Physics",
  volume =    "228",
  number =    "15",
  pages =     "5454--5469",
  year =      "2009",
  doi =       "10.1016/j.jcp.2009.04.029",
  keywords =  "Kalman filter, Data assimilation, Polynomial
              chaos, Uncertainty quantification",
  url =       "http://www.sci.utah.edu/publications/li09/Li_JCP2009.pdf",
}