Journal article

A snapshot survey for gravitational lenses among z >= 4.0 quasars. II. Constraints on the 4.0 < z < 5.4 quasar population

GT Richards, Z Haiman, B Pindor, MA Strauss, XH Fan, D Eisenstein, DP Schneider, NA Bahcall, J Brinkmann, M Fukugita

Astronomical Journal | UNIV CHICAGO PRESS | Published : 2006