Measurement of the B s 0-B - s 0 oscillation frequency δm s in B s 0→D s -(3)π decays - Aaij, R; Adeva, B; Adinolfi, M; Adrover, C; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Alkhazov, G; Alvarez Cartelle, P; Alves, A; et al. (2012)