Gueguen, A. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Gaia Collaboration, Helmi, A., van Leeuwen, F., McMillan, P. J., Massari, D., Antoja, T., et al. (2018). Gaia Data Release 2 - kinematics of globular clusters and dwarf galaxies around the Milky Way. Astronomy & Astrophysics, 616: A12. doi:10.1051/0004-6361/201832698.