@article{13695,
      author       = "Schenk, T. and XIIth Congres of the International Society
                      of Photogrammetry in Ottawa 1972",
      title        = "Investigation Into the Condition of Normal Equations in
                      Block Triangulation by the Bundle Method  ",
      year         = "1972",
      note         = "1 sv., obr. a tab. v textu",
}