Lower bound for forward scattering amplitude
Teoretičeskaâ i matematičeskaâ fizika, Tome 24 (1975) no. 1, pp. 141-144

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In the well-known expression for the lower bound of the forward scattering amplitude $\max\limits_{E\to\infty}|f(E)|>C/E^2$ the expression for the constant $C$ is found. A similar bound is obtained for finite energies.
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     author = {Yu. S. Vernov and M. N. Mnatsakanova},
     title = {Lower bound for forward scattering amplitude},
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Yu. S. Vernov; M. N. Mnatsakanova. Lower bound for forward scattering amplitude. Teoretičeskaâ i matematičeskaâ fizika, Tome 24 (1975) no. 1, pp. 141-144. http://geodesic.mathdoc.fr/item/TMF_1975_24_1_a17/