Geodesic
Application of field theory methods in the Ising model.~I
Teoretičeskaâ i matematičeskaâ fizika, Tome 14 (1973) no. 2, pp. 272-276

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Using the analogy between the Ising model and an essentially nonlinear field theory it is shown that the selfconsistent Curie-Weiss solution can be obtained from a certain functional equation and that it corresponds to the quasiclassical approximation in field theory. The appearance of spontaneous magnetization can be interpreted as the formation of bound states. 
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     author = {I. V. Volovich and E. A. Dynin and V. A. Zagrebnov and V. P. Frolov},
     title = {Application of field theory methods in the {Ising} {model.~I}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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I. V. Volovich; E. A. Dynin; V. A. Zagrebnov; V. P. Frolov. Application of field theory methods in the Ising model.~I. Teoretičeskaâ i matematičeskaâ fizika, Tome 14 (1973) no. 2, pp. 272-276. http://geodesic.mathdoc.fr/item/TMF_1973_14_2_a11/