Geodesic
A~method of calculating the partition function of a~system of phonons with allowance for anharmonicit
Teoretičeskaâ i matematičeskaâ fizika, Tome 75 (1988) no. 2, pp. 288-294

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A new method is proposed for calculating the partition function for a system of phonons with allowance for anharmonicity. In the thermodynamic limit, the partition function can be calculated exactly without a series expansion in powers of the anharmonicity. 
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     author = {A. O. Melikyan and S. M. Saakyan},
     title = {A~method of calculating the partition function of a~system of phonons with allowance for anharmonicit},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {288--294},
     publisher = {mathdoc},
     volume = {75},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_75_2_a12/}
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A. O. Melikyan; S. M. Saakyan. A~method of calculating the partition function of a~system of phonons with allowance for anharmonicit. Teoretičeskaâ i matematičeskaâ fizika, Tome 75 (1988) no. 2, pp. 288-294. http://geodesic.mathdoc.fr/item/TMF_1988_75_2_a12/