Geodesic
Renormalized $S$ matrix obtained by a smooth interaction cutoff with respect to the spatial variables
Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 1, pp. 33-41

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The renormalized $S$ matrix corresponding to a translationally-invariant Hamiltonian is considered. The relationship is found between this matrix and the matrix coastructed from the Hamiltonian in which a smooth cutoff is made with respect to the spatial variables. 
@article{TMF_1973_16_1_a2,
     author = {V. N. Likhachev},
     title = {Renormalized $S$ matrix obtained by a smooth interaction cutoff with respect to the spatial variables},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {33--41},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_16_1_a2/}
}
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V. N. Likhachev. Renormalized $S$ matrix obtained by a smooth interaction cutoff with respect to the spatial variables. Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 1, pp. 33-41. http://geodesic.mathdoc.fr/item/TMF_1973_16_1_a2/