Geodesic
Deser–Gilbert–Sudarshan representation for fungtions with an isolated branch in the spectrum
Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 1, pp. 137-139 Cet article a éte moissonné depuis la source Math-Net.Ru

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Necessary and sufficient conditions for the energy-momentum spectrum of a theory to contain an isolated branch are found for the spectral function of the Deser–Gilbert–Sudarshan representation for causal commutators. 
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     title = {Deser{\textendash}Gilbert{\textendash}Sudarshan representation for fungtions with an isolated branch in the spectrum},
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G. Sh. Dzhaparidze; V. A. Petrov. Deser–Gilbert–Sudarshan representation for fungtions with an isolated branch in the spectrum. Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 1, pp. 137-139. http://geodesic.mathdoc.fr/item/TMF_1979_40_1_a13/

[1] L. S. Brown, Lecture at Colorado Summer School, Interscience, New York, 1970; R. A. Brandt, Phys. Rev., D1 (1970), 2808 ; Н. Н. Боголюбов, В. С. Владимиров, А. Н. Тавхелидзе, ТМФ, 12 (1972), 305

[2] R. Bartel, Preprint OIYaI R4-10954, Dubna, 1977

[3] S. Deser, W. Gilbert, E. Sudarshan, Phys. Rev., 115 (1959), 731 | DOI | MR