@misc{75901,
  author = {J. Pailleux and P. Undén},
  title = {Software organization of the variational analysis: Format of observations},
  year = {1989},
  journal = {ECMWF Technical Memoranda},
  number = {164},
  pages = {20},
  month = {11/1989},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  url = {https://www.ecmwf.int/node/11482},
  doi = {10.21957/pwycoovol},
  language = {eng},
}