Hasinger, G. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Mateos, S., Barcons, X., Carrera, F. J., Page, M. J., Ceballos, M. T., Hasinger, G., et al. (2007). XMM-Newton observations of the Lockman Hole - V. Time variability of the brightest AGN. Astronomy & Astrophysics, 473(1), 105-120. doi:10.1051/0004-6361:20077909.