The X-Ray Background: Observations
arXiv:astro-ph/9311026
Abstract
Invited review talk given at the Meeting on "Extragalactic Background Radiation: A meeting in honor of Riccardo Giacconi" Baltimore, May 18-20, 1993 Ro be published by Cambridge University Press
plain tex figures available on request Bologna Astrophysics Preprint No. 11-1993-039-OAB