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\bibitem{Ren_etal2017} Ren, X. L., Alvarez-Ruso, L., Geng, L. S., Ledwig, T., Meng, J., \& Vicente Vacas, M. J. (2017). Consistency between SU(3) and SU(2) covariant baryon chiral perturbation theory for the nucleon mass. \textit{Phys. Lett. B}, \textit{766}, 325--333.

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