@article{20376,
      author       = "Werkspoor and FIG - XIII. Internationaler Kongress der Verm
                      messungsingenieure vom 1.-10. September 1971 in Wiesbaden.
                      Kommission 5: Indtrumente und Methoden",
      title        = "Nivelmatic. Multipoint precision levelling instrument  ",
      year         = "1971",
      note         = "1 seš., FIRLIT",
}