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\bibitem{Holz_etal2021} Holz, S., Plenter, J., Xiao, C. W., Dato, T., Hanhart, C., Kubis, B., et al. (2021). Towards an improved understanding of eta -> gamma*gamma *. \textit{Eur. Phys. J. C}, \textit{81}(11), 1002--15pp.

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