Hasinger, G. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Gilli, R., Comastri, A., & Hasinger, G. (2006). The evolving obscured AGN population and the cosmic X-ray background. In A. Wilson (Ed.), Proceedings of the X-ray Universe 2005 (pp. 813-818). Noordwijk, The Netherlands: ESA Publications Division.