Geodesic
Massless limit in~the ladder approximation
Teoretičeskaâ i matematičeskaâ fizika, Tome 32 (1977) no. 3, pp. 348-353

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Solutions of the equation for the absorptive part of the forward scattering amplitude are found for 3 massless models. In the $\varphi^3$ model the asymptotics of the amplitude gets exponentially increasing while in the $\varphi^4$ model and in the spinor electrodynamics the massless limit does not change asymptotical properties of them amplitude. 
@article{TMF_1977_32_3_a4,
     author = {K. G. Klimenko and V. E. Rochev},
     title = {Massless limit in~the ladder approximation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {348--353},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_32_3_a4/}
}
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K. G. Klimenko; V. E. Rochev. Massless limit in~the ladder approximation. Teoretičeskaâ i matematičeskaâ fizika, Tome 32 (1977) no. 3, pp. 348-353. http://geodesic.mathdoc.fr/item/TMF_1977_32_3_a4/