@article{11958,
      author       = "Herrick, S. and VIIIth International Astronautical
                      Congress, Barcelona 1957",
      title        = "Gravitational and Related Constants for Accurate Space
                      Navigation  ",
      note         = "1 sv., zvl. otisk, DD- kopije, a j. autoři, Fotokopie,
                      Článek z publikace: VIIIth International Astronautical
                      Congress, Barcelona 1957, Wien, Springer Verlag 1958",
}