@article{30168,
      author       = "Richardus, Peter and Agricultural Univ. and VIII. Internat.
                      Kurs für Ingenieurvermessung, Zürich 24. Sept. - 1. Okt.
                      1980",
      title        = "Special Aspects of Horizontal Tunnel Control - Surveys  ",
      year         = "1980",
      note         = "Liter. - 1 sv.",
}