The X-ray background 
edited by X. Barcons and A. C. Fabian                                                 
 - Cambridge  Cambridge University Press  1992 
 - xiii, 310p. 
<br/><br/><label>ISBN: </label>0-521-41651-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>X-rays, Cosmic x-rays, Universe
<br/><br/><label>Universal Decimal Class. No.: </label>52-735  / THE