Geodesic
Bilocal variables in the physics of condensed media
Teoretičeskaâ i matematičeskaâ fizika, Tome 81 (1989) no. 3, pp. 385-404 
N. V. Goncharov. Bilocal variables in the physics of condensed media. Teoretičeskaâ i matematičeskaâ fizika, Tome 81 (1989) no. 3, pp. 385-404. http://geodesic.mathdoc.fr/item/TMF_1989_81_3_a4/
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     title = {Bilocal variables in~the physics of~condensed media},
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The formulation of the statistical physics model problems is given in terms of continual integration over the bilocal variables. By using the stationary phase method the perturbation theory and the corresponding diagram technique are developed. The free energy, the one- and the two-particle spectra of the theory are investigated.

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