@article{13501,
      author       = "Boedecker, Gerd and IUGG XX General Assembly IAG, Vienna,
                      August 11-24, 1991",
      title        = "International Association of Geodesy - Working Group 2
                      (WG2): World Gravity Standards - Activity report 1987 - 1991
                       ",
      year         = "1991",
      note         = "Liter. - Obr.",
}