@article{21031,
      author       = "Vieira, R. and Makinen, J. and Camacho, A.G. and Sevilla,
                      M.J.",
      title        = "Observaciones absolutas de la gravedad en Espaňa  ",
      year         = "1991",
      note         = "4 tab. - 2 obr. v textu. - Liter.",
}