@article{4315,
      author       = "Andersen, O. B. and Forsberg, R. and Knudsen, P. and IAG
                      Sci. Assem., Rio de Janeiro, 1997",
      title        = "Comparison of altimetric and shipborne marine gravity over
                      ice-free and ice-covered polar seas  ",
      year         = "1997",
      note         = "Lit. - 1 sv.",
}