@article{27259,
      author       = "Heiskanen, W. A. and XII Assemblée Génerale de l'UGGI a
                      Helsinki, 1960",
      title        = "Report on the Activity of the Isostatic Institute of the
                      IAG in 1957 - 59  ",
      year         = "1960",
      note         = "1 sv.",
}