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\bibitem{Nys_etal2017} Nys, J., Mathieu, V., Fernandez-Ramirez, C., Hiller Blin, A. N., Jackura, A., Mikhasenko, M., et al. (2017). Finite-energy sum rules in eta photoproduction off a nucleon. \textit{Phys. Rev. D}, \textit{95}(3), 034014--20pp.

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