Strong, A. W. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
The Fermi LAT Collaboration, Ackermann, M., Ajello, M., Albert, A., Baldini, L., Barbiellini, G., et al. (2015). Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background. Journal of Cosmology and Astroparticle Physics, 2015(9): 008, pp. 1-40. doi:10.1088/1475-7516/2015/09/008.