@article{27115,
      author       = "IUGG XX General Assembly IAG, Vienna, August 11-24, 1991",
      title        = "Report of IAG Section 3. Determination of the Gravity
                      Field. During the Period from September 1987 to August 1991 
                      ",
      year         = "1991",
      note         = "Liter. - Tab. v textu",
}