@Article{SCI:Guo2018a,
  author =    "L. Guo and A. Narayan and T. Zhou",
  title =     "A gradient enhanced ℓ1-minimization for sparse
              approximation of polynomial chaos expansions",
  journal =   "Journal of Computational Physics",
  volume =    "367",
  pages =     "49--64",
  year =      "2018",
  publisher = "Elsevier BV",
  month =     "Aug",
  url =       "http://www.sci.utah.edu/publications/Guo2018a/1-s2.0-S0021999118302420-main.pdf",
}