Observation of sequential Υ suppression in PbPb collisions. (Physical Review Letters, 2012)

(untitled) - Chatrchyan, S; Khachatryan, V; Sirunyan, A; Tumasyan, A; Adam, W; Aguilo, E; Bergauer, T; Dragicevic, M; Erö, J; Fabjan, C; Friedl, M; Frühwirth, R; et al.