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G. Cohen-Tannoudji, F. Heney, G. L. Kane andW. J. Zakrzewski:Phys. Rev. Lett.,26, 112 (1971).
When ψ(v, x) is given by\( \psi \left( {v,x} \right) = \frac{1} {{\left( {2\pi i} \right)^2 }}\oint {ds'\oint {dt'} } \frac{{M\left( {s',t'} \right)}} {{\left[ {xs' + \left( {1 - x} \right)t' - v} \right]^2 }}, \) where the contours are large semi-circles in the upper half planes, this representation becomes the Nakanishi representation ref. (3).
N. Nakanishi:Phys. Rev.,127, 1380 (1962).
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Taha, M.O. Dual amplitudes with Mandelstam analyticity. Lett. Nuovo Cimento 2, 290–292 (1971). https://doi.org/10.1007/BF02803926
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DOI: https://doi.org/10.1007/BF02803926