Authors: Rodrigo A Ibata; Geraint F Lewis; Anthony R Conn; Michael J Irwin; Alan W McConnachie; Scott C Chapman; Michelle L Collins; Mark Fardal; Annette M N Ferguson; Neil G Ibata; A Dougal Mackey; Nicolas F Martin; Julio Navarro; R Michael Rich; David Valls-Gabaud; Lawrence M Widrow Journal: Nature Date: 2013-01-03 Impact factor: 49.962