@article{13887,
      author       = "Simonsen, O. and Second Symposium for the Commission on
                      Recent Crustal Movements held in Aulanko in Finland in
                      August 1965",
      title        = "Is the Levelling Datum for a Continental Levelling Network
                      so Stable that it Would Permit the Determination of Secular
                      Movements as Accurate as Modern Precise Levellings May be
                      Observed  ",
      year         = "1965",
      note         = "1 brož., 2 brož.",
}