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1993MNRAS.264...35F - Mon. Not. R. Astron. Soc., 264, 35-49 (1993)
Hard and soft X-ray selected active galactic nuclei two distinct populations ?
FRANCESCHINI A., MARTIN-MIRONES J.M., DANESE L. and DE ZOTTI G.
Journal keyword(s):
Simbad objects: 5
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