Freyberg, M. J. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Hasinger, G. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Soltan, A. M., Freyberg, M. J., & Hasinger, G. (2005). Signs of warm-hot intergalactic medium in the soft X-ray background. Astronomy & Astrophysics, 436(1), 67-73. doi:10.1051/0004-6361:20042389.