Geodesic
Relationship between the elastic forward scattering amplitudes for a particle and antiparticle at finite energies
Teoretičeskaâ i matematičeskaâ fizika, Tome 4 (1970) no. 1, pp. 3-6 
Yu. S. Vernov. Relationship between the elastic forward scattering amplitudes for a particle and antiparticle at finite energies. Teoretičeskaâ i matematičeskaâ fizika, Tome 4 (1970) no. 1, pp. 3-6. http://geodesic.mathdoc.fr/item/TMF_1970_4_1_a0/
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     title = {Relationship between the elastic forward scattering amplitudes for a~particle and antiparticle at finite energies},
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Voir la notice de l'article provenant de la source Math-Net.Ru

Using the general postulates the following relationship is proved: $$ \left|\int_{E_1}^{E_2}\ln\right|\frac{f_{+}(E')}{f_{-}(E')}\left|\frac{dE'}{E'}\right|<\pi^2, $$ where $f_{+}(E)$, $(f_{-}(E))$ is the elastic forward scattering amplitude for the particle (antiparticle). $E_1$, $E_2$ – arbitrary energies in l.s. Amplitudes $f_{\pm}(E)$ are proved to have no zeros in the complex plane of $E$.

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