Authors: P D Jepson; M Arbelo; R Deaville; I A P Patterson; P Castro; J R Baker; E Degollada; H M Ross; P Herráez; A M Pocknell; F Rodríguez; F E Howie; A Espinosa; R J Reid; J R Jaber; V Martin; A A Cunningham; A Fernández Journal: Nature Date: 2003-10-09 Impact factor: 49.962