@article{26718,
      author       = "Altamini, Z. and Boucher, C. and 20th General Assembly of
                      the IUGG, 11 - 24 August 1991, Viena",
      title        = "Realization of the IERS Terrestrial Reference System  ",
      year         = "1991",
      note         = "Abstr. - Liter. - Tab., obr.",
}