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The only properties of convex analysis used in this note are elementary and can be found in:R. T. Rockafellar:Convex Analysis, Chap. I, Sect.10, 32 (Princeton, N. J., 1970).
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Berceanu, S., Gheorghe, A. & Mihul, E. Five-particle amplitudes near physical regions. Lett. Nuovo Cimento 9, 245–250 (1974). https://doi.org/10.1007/BF02754033
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DOI: https://doi.org/10.1007/BF02754033