Galactic and extragalactic sources of very high energy gamma rays D. Bose, V. R. Chitnis, P. Majumdar and A. Shukla Eur. Phys. J. Spec. Top., 231 1 (2022) 27-66 Published online: 13 January 2022 DOI: 10.1140/epjs/s11734-022-00434-8