Geodesic
Generalized principle of~the argument and logarithmic sum rules
Teoretičeskaâ i matematičeskaâ fizika, Tome 43 (1980) no. 1, pp. 124-127

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With the help of the generalised principle of the argument, the sum rules are obtained for the logarithm of ratio of the moduli of particle and antiparticle elastic scattering amplitudes. Phase representation for the difference of the logarithms of the amplitudes is also obtained. 
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     author = {A. F. Kurbatov},
     title = {Generalized principle of~the argument and logarithmic sum rules},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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A. F. Kurbatov. Generalized principle of~the argument and logarithmic sum rules. Teoretičeskaâ i matematičeskaâ fizika, Tome 43 (1980) no. 1, pp. 124-127. http://geodesic.mathdoc.fr/item/TMF_1980_43_1_a14/