Clerc, N. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Pierre, M., Pacaud, F., Adami, C., Alis, S., Altieri, B., Baran, N., et al. (2016). The XXL Survey - I. Scientific motivations − XMM-Newton observing plan − Follow-up observations and simulation programme. Astronomy & Astrophysics, 592: A1, pp. 1-16. doi:10.1051/0004-6361/201526766.