Observation of the rare B 0 s →μ + μ - decay from the combined analysis of CMS and LHCb data - Khachatryan, V; Sirunyan, AM; Tumasyan, A; Adam, W; Bergauer, T; Dragicevic, M; Erö, J; Friedl, M; Frühwirth, R; Ghete, VM; Hartl, C; Beluffi, C; et al. (Nature Publishing Group, 2015)