Footnotes
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Höhler, G., Kaiser, F., Kohl, H. et al. Isospin bounds and zeros of pion-nucleon scattering amplitudes. Lett. Nuovo Cimento 5, 413–419 (1972). https://doi.org/10.1007/BF02905265
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DOI: https://doi.org/10.1007/BF02905265