@article{432,
      author       = "Welander, Erik and VIII International Congress of
                      Photogrammetry, Stockholm, July 1956",
      title        = "A preliminary investigation into the resolving limit of
                      aerial photographs  ",
      year         = "1956",
      note         = "1 sv., 1 sv., Zvl. ot. z čas.:Rikets Allmänna Kartverks
                      Meddelande nr. 27",
}