Geodesic
On the proof that the $S$ matrix is unitary
Teoretičeskaâ i matematičeskaâ fizika, Tome 25 (1975) no. 1, pp. 20-29 Cet article a éte moissonné depuis la source Math-Net.Ru

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Formal proof of the unitarity of the $S$-matrix in the functional form is gilven. The following assertion is proved: if in the perturbation theory the intermediate regularisation is introduced by means of the propagators of vitrual particles and the finite limit when the regularisation is taken off, exists, then the limiting $S$-matrix is unitary. 
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G. V. Efimov. On the proof that the $S$ matrix is unitary. Teoretičeskaâ i matematičeskaâ fizika, Tome 25 (1975) no. 1, pp. 20-29. http://geodesic.mathdoc.fr/item/TMF_1975_25_1_a2/

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