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\bibitem{GuerreroNavarro_etal2019} Guerrero Navarro, G. H., Vicente Vacas, M. J., Hiller Blin, A. N., \& Yao, D. L. (2019). Pion photoproduction off nucleons in covariant chiral perturbation theory. \textit{Phys. Rev. D}, \textit{100}(9), 094021--18pp.

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