Aaij, R., Abellan Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., Adrover, C., et al. (2012). Measurement of relative branching fractions of B decays to psi(2S) and J/psi mesons. European Physical Journal C, 72(8): 2118. doi:10.1140/epjc/s10052-012-2118-7.