Geodesic
Limit transition with respect to the imaginary additional mass in Feynman amplitudes
Teoretičeskaâ i matematičeskaâ fizika, Tome 22 (1975) no. 3, pp. 307-313

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The problem of limit transition to zero value of the imaginary additional mass in chronological convolutions is reinvestigated. It is shown that this limit transition can be performed at the very beginning if the intermediate regularization in the products of chronological convolutions is removed. 
@article{TMF_1975_22_3_a2,
     author = {D. A. Slavnov},
     title = {Limit transition with respect to the imaginary additional mass in {Feynman} amplitudes},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {307--313},
     publisher = {mathdoc},
     volume = {22},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1975_22_3_a2/}
}
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D. A. Slavnov. Limit transition with respect to the imaginary additional mass in Feynman amplitudes. Teoretičeskaâ i matematičeskaâ fizika, Tome 22 (1975) no. 3, pp. 307-313. http://geodesic.mathdoc.fr/item/TMF_1975_22_3_a2/