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We adopt the notion « complex distribution » which was introduced byN. Nakanishi (6). Here we use his notation for complex distribution.
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Kawai, T., Masuda, N. Nonexisting region of the resonance poles in the scattering amplitudes with unstable particles. Nuovo Cim 32, 248–252 (1964). https://doi.org/10.1007/BF02732612
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DOI: https://doi.org/10.1007/BF02732612