00866nam a2200205Ia 4500003000900000008004100009020001800050040001600068080002900084111010000113245023800213260004000451300001900491490002100510650002700531650004100558650002000599700002300619700001800642IN-BaIIA211028s9999    xx            000 0 eng d  a92-9092-026-2  cIIA Library  a524.64-735(082.1)bESA-2  aESLAB Symposium on Two Topics in X-Ray Astronomy, vol. 2n23rdcBologna, Italyd1989 Sep. 13-20 0aAGN and X-Ray backgroundbproceedings of the 23rd ESLAB symposium on two topics in X-Ray astronomy, vol. 2, held in Bologna, Italy, 13-20 Sept 1989cedited by J. Hunt and B. Battrick                                                     aFrancebEuropean Space Agencyc1989  avi, 707-1143p.  aESA SP-296; v. 2  aActive galactic nuclei  aAstronomy and astrophysics thesaurus  aX-ray astronomy  aBattrick, B ., ed.  aHunt, J., ed.