Spectral Statistics and Luminosity Function of a Hard X-ray Complete   Sample of Brightest AGNs
  We investigated the statistics of the X-ray spectral properties of a complete flux-limited sample of bright AGNs from HEAO-1 all-sky catalogs to provide the bright end constraint of the evolution of AGN hard X-ray luminosity function (HXLF) and the AGN population synthesis model of the X-ray background. Spectral studies have been made using ASCA and XMM-Newton observation data for almost all AGNs in this sample. 
K. Shinozaki, T. Miyaji, Y. Ishisaki, Y. Ueda, Y. Ogasaka, K.   Hayashida, and H. Awaki