@manual{75871,
  author = {K. Onogi},
  title = {The long-term performance of the radiosonde observing system to be used in ERA-40},
  year = {2000},
  journal = {ERA-40 Project Report Series},
  number = {2},
  pages = {77},
  month = {08/2000},
  publisher = {ECMWF},
  address = {Shinfield Park, Reading},
  language = {eng},
}