Geodesic
Bogolyubov's $R$-operation for local interactions
Teoretičeskaâ i matematičeskaâ fizika, Tome 20 (1974) no. 2, pp. 147-159 Cet article a éte moissonné depuis la source Math-Net.Ru

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Parametric representations are constructed for the finite parts of Feynman amplitudes corresponding to the renormalized perturbation series for the $S$-matrix with a special regularization. These representations are obtained as limiting values for the Feynman amplitudes in spaces with indefinite metric, which enables one to verify unitarity and causality of the $S$-matrix in all perturbation orders. 
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V. D. Gordevskii; O. V. Uvarov; I. Yu. Chudinovich; V. A. Shcherbina. Bogolyubov's $R$-operation for local interactions. Teoretičeskaâ i matematičeskaâ fizika, Tome 20 (1974) no. 2, pp. 147-159. http://geodesic.mathdoc.fr/item/TMF_1974_20_2_a0/

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