@article{13530,
      author       = "Wenzel, Hans-Georg and IUGG XX General Assembly IAG,
                      Vienna, August 11-24, 1991",
      title        = "International Gravity Commission. Working Group No. 7.
                      Computation of Mean Gravity Anomalies. Report for the Period
                      June 1988 to August 1991  ",
      year         = "1991",
      note         = "Liter. - Obr. a tab.",
}