@article{19675,
      author       = "Haagmans, R.H.N. and Husti, G.J. and Plugers, P. and Smit,
                      J.H.M. and Strang, van Hess, G.L.",
      title        = "NAVGRAV Navigation and gravimetric experiment at the North
                      Sea  ",
      year         = "1988",
      note         = "Obr. a tab. v textu. - Liter. - 1 sv.",
}