Geodesic
A~method for calculating time correlation functions
Teoretičeskaâ i matematičeskaâ fizika, Tome 18 (1974) no. 2, pp. 286-295

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A device that makes it possible to express a two-time Green's function in terms of higher correlation functions is used to develop a method for constructing a system of equations for the energies of correlation functions. Solutions of the system are considered in the limiting cases of long ($\vert t\vert\to\infty$) and short ($t\to\infty$) times. A calculation of the time of spin-spin relaxation in a rigid lattice by the proposed method yields a finite expression, while the ordinary procedure of decoupling leads to a trivial result. 
@article{TMF_1974_18_2_a14,
     author = {R. R. Nigmatullin},
     title = {A~method for calculating time correlation functions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {286--295},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_18_2_a14/}
}
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R. R. Nigmatullin. A~method for calculating time correlation functions. Teoretičeskaâ i matematičeskaâ fizika, Tome 18 (1974) no. 2, pp. 286-295. http://geodesic.mathdoc.fr/item/TMF_1974_18_2_a14/