@article{4120,
      author       = "Boulanger, Ju. D. and Demjanova, T. E. and Inst. of
                      Seismol. Tur. SSR Ašchabad and 19. IUGG - Vancouver, Aug.
                      9-22, 1987",
      title        = "Changes in gravity in the Ashkhabad City area  ",
      year         = "1987",
      note         = "Liter. - 3 obr. příl., 1 sv.",
}