Authors: Daniel J Mortlock; Stephen J Warren; Bram P Venemans; Mitesh Patel; Paul C Hewett; Richard G McMahon; Chris Simpson; Tom Theuns; Eduardo A Gonzáles-Solares; Andy Adamson; Simon Dye; Nigel C Hambly; Paul Hirst; Mike J Irwin; Ernst Kuiper; Andy Lawrence; Huub J A Röttgering Journal: Nature Date: 2011-06-29 Impact factor: 49.962