@phdthesis{74790,
  author = {Hans Hersbach},
  title = {Prospects of the variational approach},
  year = {2001},
  journal = {Ocean Wave Forecasting, 2-4 July 2001},
  pages = {117-126},
  month = {2001},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}