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\bibitem{BABARCollaborationLees_etal2010} BABAR Collaboration(Lees, J. P. et al), Azzolini, V., Lopez-March, N., Martinez-Vidal, F., Milanes, D. A., \& Oyanguren, A. (2010). Measurement of the gamma gamma* -> eta c transition form factor. \textit{Phys. Rev. D}, \textit{81}(5), 052010--18pp.

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