@article{17690,
      author       = "Hytönen, Erkki and Symposium on the Figure of the Earth
                      and Refraction, 14 - 17 March 1967, Vienna",
      title        = "Measuring of the refraction in the Second Levelling of
                      Finland  ",
      year         = "1967",
      note         = "1 seš.",
}