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\bibitem{BABARCollaborationdelAmoSanchez_etal2011} BABAR Collaboration(del Amo Sanchez, P. et al), Lopez-March, N., Martinez-Vidal, F., Milanes, D. A., \& Oyanguren, A. (2011). Observation of the Decay B- -> D_s(*) K- l- nu(bar). \textit{Phys. Rev. Lett.}, \textit{107}(4), 041804--8pp.

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