@article{Reich2019,
  author    = {Sebastian Reich},
  title     = {Data assimilation},
  journal   = {Acta numerica},
  series    = {the Schr{\"o}dinger perspective},
  volume    = {28},
  pages     = {635 -- 711},
  doi       = {10.1017/S0962492919000011},
  year      = {2019},
}