Geodesic
Thermodynamics and excited states of the Heisenberg model
Teoretičeskaâ i matematičeskaâ fizika, Tome 63 (1985) no. 2, pp. 303-311

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It is shown that there exists a limit density of the distribution of the real values of the parameters characterizing the Bethe eigenvector for the excited states of the quantum lattice Heisenberg model. A system of integrodifferential equations is obtained for this density. 
@article{TMF_1985_63_2_a12,
     author = {E. V. Gusev},
     title = {Thermodynamics and excited states of the {Heisenberg} model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {303--311},
     publisher = {mathdoc},
     volume = {63},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1985_63_2_a12/}
}
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E. V. Gusev. Thermodynamics and excited states of the Heisenberg model. Teoretičeskaâ i matematičeskaâ fizika, Tome 63 (1985) no. 2, pp. 303-311. http://geodesic.mathdoc.fr/item/TMF_1985_63_2_a12/