@article{20252,
      author       = "Ihde, J. and Schirmer, U. and Stefani, F. and IAG Sci.
                      Assem., Rio de Janeiro, 1997",
      title        = "The new German geoid derived by gravity, GPS and levelling 
                      ",
      year         = "1997",
      note         = "Lit. - Abstr. - 1 sv.",
}