@manual{76891,
  author = {W. Wergen},
  title = {Diabatic nonlinear normal mode initialisation for a spectral model with a hybrid vertical coordinate},
  year = {1987},
  number = {59},
  pages = {83},
  month = {01/1987},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}