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1994AJ....108..759B - Astron. J., 108, 759-765 (1994)
X-ray spectral evolution of high redshift quasars.
BECHTOLD J., ELVIS M., FIORE F., KUHN O., CUTRI R.M., McDOWELL J.C., RIEKE M., SIEMIGINOWSKA A. and WILKES B.J.
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Simbad objects: 19
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