First observation of the decay $\bar{B}^0_s → D^0 K^{*0}$ and a measurement of the ratio of branching fractions $\frac{{\cal B}(\bar{B}^0_s → D^0 K^{*0})}{{\cal B}(\bar{B}^0 → D^0 ρ^0)}$ (Physics Letters B, 2011)

(untitled) - Collaboration, L; Aaij, R; Beteta, C; Adeva, B; Adinolfi, M; Adrover, C; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Alkhazov, G; et al.