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Siemens, D.; Ruiz de Elvira Carrascal, Jacobo; Epelbaum, E.; Hoferichter, M.; Krebs, H.; Kubis, B.; Meißner, U.-G. (2017). Reconciling threshold and subthreshold expansions for pion–nucleon scattering. Physics letters. B, 770, pp. 27-34. Elsevier 10.1016/j.physletb.2017.04.039
