X RAY & GAMMA RAY BACKGROUND: General: de Zotti et al. 93/02; Giommi et al. 98/12; Fabian 2000/01; Gilli 2003/03; The cosmic X-ray background: abundance and evolution of hidden black holes by Roberto Gilli [2013/04] Gamma-rays from Blazars and the Extragalactic Background Light by Luigi Costamante [International Journal of Modern Physics D 22, 13300255 (2013)] The role of the background in past and future X-ray missions by Silvano Molendi [2016/11] Surveys of the cosmic X-ray background by W. N. Brandt and G. Yang [2021/11] Type: GALACTIC: Diffuse X-Ray Sky in the Galactic Center by Katsuji Koyama [2017/08] Re: ACTIVE GALACTIC NUCLEI: Giommi et al. 98/12; Comastri 98/12; Almaini 2000/01; Fabian 2000/01; Re: GALACTIC EVOLUTION: Fabian 2000/01; THE NET ADVANCE OF PHYSICS
X RAY & GAMMA RAY BACKGROUND: