Geodesic
Onsager approximation and asymptotically exact solution of the Ashkin–Teller model
Teoretičeskaâ i matematičeskaâ fizika, Tome 83 (1990) no. 1, pp. 83-91 Cet article a éte moissonné depuis la source Math-Net.Ru

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The Onsager approximation of the Ashkin–Teller model is constructed. In certain ranges of variation of the parameters of the model this approximation is asymptotically exact. In particular, for the isotropic model it gives the exact asymptotic behavior for the phase curves, and for the anisotropic model it gives the asymptotic behavior of the critical surfaces. 
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     author = {E. V. Gusev},
     title = {Onsager approximation and asymptotically exact solution of~the {Ashkin{\textendash}Teller} model},
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}
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E. V. Gusev. Onsager approximation and asymptotically exact solution of the Ashkin–Teller model. Teoretičeskaâ i matematičeskaâ fizika, Tome 83 (1990) no. 1, pp. 83-91. http://geodesic.mathdoc.fr/item/TMF_1990_83_1_a9/

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