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\bibitem{LHCbCollaborationAaij_etal2013} LHCb Collaboration(Aaij, R. et al), Oyanguren, A., \& Ruiz Valls, P. (2013). Observation of B-c(+) -> J/ psi D-s(+) and B-c(+) -> J/ psi D-s*(+) decays. \textit{Phys. Rev. D}, \textit{87}(11), 112012--10pp.

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