Binary quasars in the sloan digital sky survey: Evidence for excess clustering on small scales

Joseph F. Hennawi, Michael A. Strauss, Masamune Oguri, Naohisa Inada, Gordon T. Richards, Bartosz Pindor, Donald P. Schneider, Robert H. Becker, Michael D. Gregg, Patrick B. Hall, David E. Johnston, Xiaohui Fan, Scott Burles, David J. Schlegel, James E. Gunn, Robert H. Lupton, Neta A. Bahcall, Robert J. Brunner, Jon Brinkmann