Geodesic
Nonpolynomial Lagrangians (higher perturbation orders)
Teoretičeskaâ i matematičeskaâ fizika, Tome 11 (1972) no. 3, pp. 273-287

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It is shown that a theory with a nonpolynomial Lagrangian remains finite in higher perturbation orders in the principal coupling constant $G$. It is also shown that the $S$ matrix remains unitary in the third perturbation order in $G$. The order of growth of the scattering amplitude is found in an arbitrary perturbation order. 
@article{TMF_1972_11_3_a0,
     author = {M. K. Volkov},
     title = {Nonpolynomial {Lagrangians} (higher perturbation orders)},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {273--287},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1972_11_3_a0/}
}
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M. K. Volkov. Nonpolynomial Lagrangians (higher perturbation orders). Teoretičeskaâ i matematičeskaâ fizika, Tome 11 (1972) no. 3, pp. 273-287. http://geodesic.mathdoc.fr/item/TMF_1972_11_3_a0/