Geodesic
Decoupling of chains of equations for two-time Green's functions
Teoretičeskaâ i matematičeskaâ fizika, Tome 7 (1971) no. 2, pp. 250-261 
Yu. A. Tserkovnikov. Decoupling of chains of equations for two-time Green's functions. Teoretičeskaâ i matematičeskaâ fizika, Tome 7 (1971) no. 2, pp. 250-261. http://geodesic.mathdoc.fr/item/TMF_1971_7_2_a9/
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     author = {Yu. A. Tserkovnikov},
     title = {Decoupling of chains of equations for two-time {Green's} functions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {250--261},
     year = {1971},
     volume = {7},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1971_7_2_a9/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A study is made of different methods of finding solutions of chains of equations for two-time temperature-dependent Green's flmctions which enable one to find simple expressions for the energy of elementary excitations and the damping. The proposed methods are illustrated by the examples of the single-particle Green's function and the matrix Green's function employed in the theory of superfluidity and superconductivity.

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