LHCb Collaboration, R., Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., et al. (2013). Observation of the Decay B0s → K+K- decays. Journal of high energy physics: JHEP, 2013(10): 183. doi:10.1007/JHEP10(2013)183.