@article{26817,
      author       = "Dufour, H. M. and IUGG - IAG, 15th General Assembly Moscow,
                      1 - 14 August 1971",
      title        = "Reduction des photographies de satellites sur fond
                      d'etoiles presentation resumee des resultats  ",
      note         = "1 sv., 1 sv.",
}