@article{20955,
      author       = "Ayeni, Olubodun and XIII. Congress of the International
                      Society for Photogrammetry, Helsinki, 1976. Commission III",
      title        = "Objective Terrain Description and Classification. for
                      Digital Terrain Models  ",
      year         = "1976",
      note         = "Resumé v jaz. angl., franc., něm., 1 sv.",
}