@misc{80119,
  keywords = {newsletter},
  author = {Marco Matricardi},
  title = {The direct assimilation of principal components},
  year = {2015},
  journal = {ECMWF Newsletter},
  chapter = {Meteorology},
  pages = {23-27},
  month = {2015},
  publisher = {ECMWF},
  url = {https://www.ecmwf.int/node/17332},
  doi = {10.21957/ncg6fwoi},
  language = {eng},
}