Geodesic
Exactly solvable $d$-dimensional model of a~structural phase transition
Teoretičeskaâ i matematičeskaâ fizika, Tome 63 (1985) no. 2, pp. 270-279

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The approximating Hamiltonian method is used to show that the lattice model $g\varphi^4$ with coupling constant $g=\lambda/N$ has an exact solution. The thermodynamics of the phase transition in this model is investigated. 
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     author = {N. M. Plakida and N. S. Tonchev},
     title = {Exactly solvable $d$-dimensional model of a~structural phase transition},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {270--279},
     publisher = {mathdoc},
     volume = {63},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1985_63_2_a9/}
}
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N. M. Plakida; N. S. Tonchev. Exactly solvable $d$-dimensional model of a~structural phase transition. Teoretičeskaâ i matematičeskaâ fizika, Tome 63 (1985) no. 2, pp. 270-279. http://geodesic.mathdoc.fr/item/TMF_1985_63_2_a9/