LHCb Collaboration, Aaij, R., Abellán Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., et al. (2013). Evidence for the decay B-0 -> J/psi omega and measurement of the relative branching fractions of B-s(0) meson decays to J/psi eta and J/psi eta '. Nuclear Physics B, 867(3), 547-566. doi:10.1016/j.nuclphysb.2012.10.021.