Siegert, T. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Berteaud, J., Calore, F., Iguaz, J., Serpico, P. D., & Siegert, T. (2022). Strong constraints on primordial black hole dark matter from 16 years of INTEGRAL/SPI observations. Physical Review D, 106(2):. doi:10.1103/PhysRevD.106.023030.