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\bibitem{GuerreroNavarro+VicenteVacas2020} Guerrero Navarro, G. H., \& Vicente Vacas, M. J. (2020). Threshold pion electro- and photoproduction off nucleons in covariant chiral perturbation theory. \textit{Phys. Rev. D}, \textit{102}(11), 113016--23pp.

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