Strong, A. W. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Schröder, R., Schlickeiser, R., & Strong, A. W. (2005). Diffuse galactic sub-MeV γ-ray excess from high-energy electrons. Astronomy & Astrophysics, 442(3), L45-L48. doi:10.1051/0004-6361:200500187.