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\bibitem{Alvarez-Ruso_etal2013} Alvarez-Ruso, L., Ledwig, T., Martin Camalich, J., \& Vicente Vacas, M. J. (2013). Nucleon mass and pion-nucleon sigma term from a chiral analysis of lattice QCD data. \textit{Phys. Rev. D}, \textit{88}(5), 054507--20pp.

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