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Chandra Observations of the Highest Redshift Quasars from the Sloan Digital Sky Survey, Ohad Shemmer, W. N. Brandt, Donald P. Schneider, Xiaohui Fan, Michael A. Strauss, Aleksandar M. Diamond-Stanic, Gordon T. Richards, Scott F. Anderson, James E. Gunn, Jon Brinkmann
Shemmer et al. (2006) studied this question.
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