@article{27151,
      author       = "Poitevin, C. and IUGG XX General Assembly IAG, Vienna,
                      August 11-24, 1991",
      title        = "Report of the IGG - Working Group 5: Monitoring of
                      Non-tidal Gravity Variations  ",
      year         = "1991",
      note         = "Liter. - Obr. a tab. v textu",
}