@article{21681,
      author       = "Tapley, Byron D. and University of Texas - Center for Space
                      Res. and Inter. Summer School of Theor Geodesy. Assisi,
                      Italy, May 23 - June 3, 1988",
      title        = "Orbit determination  ",
      year         = "1988",
      note         = "Obr. v textu. - Liter., 1 sv.",
}