@article{11721,
      author       = "Ádám, József and XXth IAG/IUGG Gen. Assembly, Vienna,
                      Austria, August 11-24, 1991",
      title        = "Global Geopotential Models in the Region of Hungary  ",
      year         = "1991",
      note         = "Obr. a tab. v textu. - Liter.",
}