@article{GottwaldMitchellReich2011,
  author    = {Georg A. Gottwald and Lewis Mitchell and Sebastian Reich},
  title     = {Controlling overestimation of error covariance in ensemble kalman filters with sparse observations a variance-limiting kalman filter},
  journal   = {Monthly weather review},
  volume    = {139},
  number    = {8},
  pages     = {2650 -- 2667},
  doi       = {10.1175/2011MWR3557.1},
  year      = {2011},
}