@article{4276,
      author       = "Birardi, G. and International Symposium on Satellite
                      Geodesy Budapest, 28.6. - 1.7. 1977",
      title        = "Combined use of Doppler devices and photoastronomical
                      cameras for the  institution of vertical deflection points 
                      ",
      year         = "1977",
      note         = "1 sv.",
}