@article{260,
      author       = "Leppänen, Harri and Myllyniemi, Matti and XIII. Congress
                      of the International Society for Photogrammetry, Helsinki
                      1976. Commission VII",
      title        = "A Finnish System for Forest Management Planning Using
                      Aerial Photographs  ",
      year         = "1976",
      note         = "separát, 1 sv.",
}