First observations of $\bar{B}_s^0→ D^+D^-$, $D_s^+D^-$ and $D^0\bar{D}^0$ decays (Phys.Rev. D, 2013)

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