Exploratory Chandra observations of the three highest redshift quasars known

William N. Brandt, Donald P. Schneider, Xiaohui Fan, Michael A. Strauss, James E. Gunn, Gordon T. Richards, Scott F. Anderson, Daniel E. Vanden Berk, Neta A. Bahcall, J. Brinkmann, Robert Brunner, Bing Chen, G. S. Hennessy, Donald Q. Lamb, Wolfgang Voges, Donald G. York