Determination of fs/fd for 7 TeV pp collisions and measurement of the B0¿D-K+ branching fraction - Aaij, R.; Adeva, B.; Adinolfi, M.; Adrover, C.; Affolder, A.; Ajaltouni, Z.; Albrecht, J.; Alessio, F.; Alexander, M.; Alkhazov, G.; Cartelle, P. Alvarez; Alves, A. A., Jr.; et al. (Physical Review Letters, 2011)