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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). Studies of tau(-) -> eta K- nu(tau) and tau(-) -> eta pi(-) nu(tau) at BABAR and a search for a second-class current. \textit{Phys. Rev. D}, \textit{83}(3), 032002--10pp.

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