Published in
Highlights of Spanish Astrophysics II, p. 364-364, 2001
DOI: 10.1007/978-94-017-1776-2_88
Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 1(316), p. L13-L16, 2000
DOI: 10.1046/j.1365-8711.2000.03733.x
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On the Intensity of the Extragalactic X-ray Background
