author        = "Van Camp, M. and Dassargues, A. and Delforge, D. and
                       Delobbe, L. and de Viron, O. and Francis, O.  and Kaufmann,
                       O. and Lecocq, O.  and Van Clooster, M. and Watlet, A.",
      title         = "{Hydrogeological effects on terrestrial gravity
      month         = "Dec",
      year          = "2019",
      note          = "Measuring gravity at Membach and Rochefort for more than
                       twenty years!",