@article{Francis:1771,
      author        = "Francis, Olivier and Baumann, Henri and Volarik, T. and
                       Rothleitner, C. and Klein, G. and Seil, M. and Dando, N.
                       and Tracey, R. and Ullrich, C. and Castelein, Stefaan and
                       al., et",
      title         = "{The European Comparison of Absolute Gravimeters 2011
                       (ECAG-2011) in Walferdange, Luxembourg: results and
                       recommendations}",
      year          = "2013",
}