@article{10210,
      author       = "Heiskanen, W. A. and Presented at the 11th General Assembly
                      of the IUGG in Toronto, September 1957",
      title        = "General report on the Gravimetric Computation of the
                      Undulations of the Geoid, Ng, and the Deflection of the
                      Vertical Components  and  ",
      year         = "1957",
      note         = "1 sv.",
}