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Measurement of the ratio of the B^{0}→D^{*-}τ^{+}ν_{τ} and B^{0}→D^{*-}μ^{+}ν_{μ} branching fractions using three-prong τ-lepton decays
Back, J. J..  Physical Review Letters.  v. 120. no. 17.   2018-04-27. .   

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