Authors: P G Brown; J D Assink; L Astiz; R Blaauw; M B Boslough; J Borovička; N Brachet; D Brown; M Campbell-Brown; L Ceranna; W Cooke; C de Groot-Hedlin; D P Drob; W Edwards; L G Evers; M Garces; J Gill; M Hedlin; A Kingery; G Laske; A Le Pichon; P Mialle; D E Moser; A Saffer; E Silber; P Smets; R E Spalding; P Spurný; E Tagliaferri; D Uren; R J Weryk; R Whitaker; Z Krzeminski Journal: Nature Date: 2013-11-06 Impact factor: 49.962