@article{Cellino:3749,
      author        = "Cellino, A. and Berthier, J. and Delbò, M. and Dell'Oro,
                       A. and Galluccio, L. and Mignard, F. and Muinonen, K. and
                       Pauwels, T. and Petit, J. and Spoto, F. and Tanga, P.",
      title         = "{Gaia DR2 documentation Chapter 4: Solar-System Objects}",
      year          = "2018",
}