Geodesic
The infrared bounds method in the study of boson systems
Teoretičeskaâ i matematičeskaâ fizika, Tome 108 (1996) no. 3, pp. 421-430

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This is a study of the equilibrium thermodynamics of a lattice boson gas with on-site repulsion and nearest neighbor site attraction. For this system, the existence of Bose condensate is proven and an equation for the lower estimate on the critical temperature is obtained. Moreover, the upper and lower bounds for the structure factor are derived. Finally, in the framework of the infrared bounds method, a Huang–Davies type Bose system is studied. 
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     author = {D. P. Sankovich and M. Corgini},
     title = {The infrared bounds method in the study of boson systems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {421--430},
     publisher = {mathdoc},
     volume = {108},
     number = {3},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1996_108_3_a5/}
}
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D. P. Sankovich; M. Corgini. The infrared bounds method in the study of boson systems. Teoretičeskaâ i matematičeskaâ fizika, Tome 108 (1996) no. 3, pp. 421-430. http://geodesic.mathdoc.fr/item/TMF_1996_108_3_a5/