@conference{825906,
  author = {W Lewandowski and Gerard Petit and C Thomas and Marc Weiss},
  title = {GPS Time Closure Around the World Using Precise Ephemerides, Ionospheric Measurements and Accurate Antenna Coordinates},
  year = {1991},
  month = {1991-01-01 00:01:00},
  publisher = {5^uth^ European Frequency and Time Forum , Besan{c-cedilla}on, 1, FR},
  language = {en},
}