@article{13011,
      author       = "Virtanen, Heikki and Kääriänen, Jussi",
      title        = "The Instalation of and First Results from the
                      Superconducting Gravimeter GWR20 at the Matsähovi Station.
                      Finland  ",
      year         = "1995",
      note         = "Obr. a tab. v textu.- Liter., 1 sv.",
}