Geodesic
Exactly solvable model of phase transitions
Teoretičeskaâ i matematičeskaâ fizika, Tome 71 (1987) no. 3, pp. 441-450

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Exactly solvable model is studied which shows the phase transition taking into account only interaction between fluctuations with equal and oppositely directed momenta. Critical and tricritical behaviour influence of frozen-in impurities on the phase transition is studied and it is shown that in the narrow region proportional to the impurity concentration the phase transition is smeared. 
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     author = {Yu. M. Ivanchenko and A. A. Lisyanskii and A. E. Filippov},
     title = {Exactly solvable model of phase transitions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {71},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1987_71_3_a13/}
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Yu. M. Ivanchenko; A. A. Lisyanskii; A. E. Filippov. Exactly solvable model of phase transitions. Teoretičeskaâ i matematičeskaâ fizika, Tome 71 (1987) no. 3, pp. 441-450. http://geodesic.mathdoc.fr/item/TMF_1987_71_3_a13/