@article{11716,
      author       = "Zarraca, N. and Rius, A. and Sardón, E. and 20th General
                      Assembly of the IUGG, 11 - 24 August 1991, Viena",
      title        = "Global Analysis of European Geodetic VLBI Experiments  ",
      year         = "1991",
      note         = "Lietr. - Obr. v textu",
}