@article{20493,
      author       = "Cook, A. H. and XIIth General Assembly of the IUGG in
                      Helsinki, 1960",
      title        = "Notation for Dynamical Geodesy  ",
      year         = "1960",
      note         = "1 sv., National Physical Laboratory. Special Study Group
                      No. 17 of the International Association of Geodesy",
}