@article{35052,
      author       = "Visser, J. and XIII. Congress of the International Society
                      for Photogrammetry, Helsinki, 1976. Commission IV",
      title        = "The Use of Large Scale Orthophoto Maps in Cadastral Survey
                      and for Rural and Urban Development Projects  ",
      year         = "1976",
      note         = "1 sv.",
}