@article{8613,
      author       = "Sayn-Wittgenstein, L. and Aldred, A.H. and XIII. Congress
                      of the International Society for Photogrammetry. Helsinki,
                      July 11 to 23, 1976",
      title        = "Environmental Monitoring: The Role of Remote Sensing  ",
      year         = "1976",
      note         = "separát",
}