@article{9841,
      author       = "Grafarend, Erik W. and Internat. Summer SCHOOL on Satellite
                      Geodesy. Assisi, 23.5. - 3.6.1988",
      title        = "Four Lectures on Special and General Relativity  ",
      year         = "1988",
      note         = "Obr. v textu. - Liter",
}