Geodesic
Behavior of the partition function of Dicke type models in the limit of a large number of atoms
Teoretičeskaâ i matematičeskaâ fizika, Tome 51 (1982) no. 1, pp. 73-85 
V. N. Popov; S. A. Fedotov. Behavior of the partition function of Dicke type models in the limit of a large number of atoms. Teoretičeskaâ i matematičeskaâ fizika, Tome 51 (1982) no. 1, pp. 73-85. http://geodesic.mathdoc.fr/item/TMF_1982_51_1_a6/
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     title = {Behavior of the partition function of {Dicke} type models in the limit of a~large number of atoms},
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Voir la notice de l'article provenant de la source Math-Net.Ru

Functional integration is used to obtain the asymptotic behavior of the partition function of Dicke type models in the limit $N\to\infty$, where $N$ is the number of atoms.

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