Geodesic
Spectral representation of nonequilibrium Green's functions in the Kadanoff–Baym technique
Teoretičeskaâ i matematičeskaâ fizika, Tome 84 (1990) no. 1, pp. 141-145 Cet article a éte moissonné depuis la source Math-Net.Ru

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A modification of the mathematical formalism of the Kadanoff–Baym method is proposed. Exact expressions are obtained for the retarded and advanced Green's functions and the spectral function; they are valid for arbitrary variation of an external potential field in space and time without assumption of smallness of the interparticle interactions. 
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     author = {A. S. Kondrat'ev and I. E. Lyublinskaya and V. M. Uzdin},
     title = {Spectral representation of nonequilibrium {Green's} functions in~the {Kadanoff{\textendash}Baym} technique},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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A. S. Kondrat'ev; I. E. Lyublinskaya; V. M. Uzdin. Spectral representation of nonequilibrium Green's functions in the Kadanoff–Baym technique. Teoretičeskaâ i matematičeskaâ fizika, Tome 84 (1990) no. 1, pp. 141-145. http://geodesic.mathdoc.fr/item/TMF_1990_84_1_a12/

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