@misc{74823,
  author = {R. Hoffman and J-F. Louis and T. Nehrkorn},
  title = {A method for implementing adjoint calculations in the discrete case},
  year = {1992},
  journal = {ECMWF Technical Memoranda},
  number = {184},
  pages = {20},
  month = {02/1992},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  url = {https://www.ecmwf.int/node/9906},
  doi = {10.21957/xf1snal},
  language = {eng},
}