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@ARTICLE{Helmert:445942,
      author       = {Helmert, Robert},
      title        = {{U}ntersuchung über den {E}influss eines regelmässigen
                      {F}ehlers im {G}ange der {O}kularröhre des
                      {V}isirfernrohres auf {M}essungen, insbesondere auf das
                      geometrische {N}ivellement},
      journal      = {Zeitschrift des Architekten- und Ingenieur-Vereins zu
                      Hannover},
      volume       = {22},
      number       = {3},
      address      = {Hannover},
      publisher    = {Schmorl $\&$ von Seefeld},
      reportid     = {RWTH-CONV-088884},
      pages        = {Sp. 417-424},
      year         = {1876},
      cin          = {100000},
      cid          = {$I:(DE-82)100000_20140620$},
      typ          = {PUB:(DE-HGF)16},
      url          = {https://publications.rwth-aachen.de/record/445942},
}