@phdthesis{73564,
  author = {R.N. Bannister and Mike Cullen},
  title = {A regime-dependent balanced control variable based on potential vorticity},
  year = {2007},
  journal = {ECMWF Workshop on Flow-dependent aspecyts of data assimilation, 11-13 June 2007},
  pages = {101-112},
  month = {2007},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}