References
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Baracca, A., Bramón, A. Soft-photon emission and some radiative decays of the η and χ0 mesons. Nuovo Cimento A (1965-1970) 53, 571–575 (1968). https://doi.org/10.1007/BF02800137
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DOI: https://doi.org/10.1007/BF02800137