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\bibitem{LHCbCollaborationAaij_etal2013} LHCb Collaboration(Aaij, R. et al), Oyanguren, A., \& Ruiz Valls, P. (2013). Search for D-(s)(+) -> pi(+)mu(+)mu(-) and D-(s)(+) -> pi(-)mu(+)mu(+) decays. \textit{Phys. Lett. B}, \textit{724}(4-5), 203--212.

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