Geodesic
Phase transitions in quantum models of rotators and ferroelectrics
Teoretičeskaâ i matematičeskaâ fizika, Tome 73 (1987) no. 1, pp. 111-124

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Conditions of the existence of long range order and bounds on critical temperatures are found for quantum models of rotators, quadrupoles and ferroelectrics. The method used is based on combining infrared bounds with the technique of the Wiener integrals. 
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     author = {L. A. Pastur and B. A. Khoruzhenko},
     title = {Phase transitions in quantum models of rotators and ferroelectrics},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     number = {1},
     year = {1987},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1987_73_1_a10/}
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L. A. Pastur; B. A. Khoruzhenko. Phase transitions in quantum models of rotators and ferroelectrics. Teoretičeskaâ i matematičeskaâ fizika, Tome 73 (1987) no. 1, pp. 111-124. http://geodesic.mathdoc.fr/item/TMF_1987_73_1_a10/