Geodesic
Reflection positivity and models with noncompact spin
Teoretičeskaâ i matematičeskaâ fizika, Tome 59 (1984) no. 1, pp. 154-160

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The reflection positivity method and chess-board estimates are used to study the existence of Gibbs fields with noncompact spin. This extends the class of interactions for which the thermodynamic limit exists. The “double well” potential is considered. 
@article{TMF_1984_59_1_a11,
     author = {S. B. Shlosman},
     title = {Reflection positivity and models with noncompact spin},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {154--160},
     publisher = {mathdoc},
     volume = {59},
     number = {1},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1984_59_1_a11/}
}
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S. B. Shlosman. Reflection positivity and models with noncompact spin. Teoretičeskaâ i matematičeskaâ fizika, Tome 59 (1984) no. 1, pp. 154-160. http://geodesic.mathdoc.fr/item/TMF_1984_59_1_a11/