Freyberg, M. J. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Esquej, P. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Saxton, R. D., Read, A. M., Freyberg, M. J., Esquej, P., & Altieri, B. (2008). The XMM-Newton medium-energy X-ray 'all-sky' survey. Memorie della Società Astronomica Italiana, 79(1), 204-207.