@article{14062,
      author       = "Guochang Xu and IUGG XX General Assembly IAG, Vienna,
                      August 11-24, 1991",
      title        = "Iterative Spectral Analysis and Geopotential Determination
                      Using Altimeter Data  ",
      year         = "1991",
      note         = "Obr. a tab. v textu. - Liter.",
}