Quasiclassical approximation for the models of spin-spin interaction on the one-dimensional lattice
Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part VI, Tome 133 (1984), pp. 63-76

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The one-dimensional anisotropic Heisenberg model in the exterior field is considered. For the corresponding energy operator with parameter $h$ the quasiclassical ($h\to0$) spectral expansion is constructed. In the integrable case (in the absence of the exteriour field) the results obtained coincide with the exact ones.
@article{ZNSL_1984_133_a4,
     author = {Yu. M. Vorob'ev and S. Yu. Dobrokhotov and V. P. Maslov},
     title = {Quasiclassical approximation for the models of spin-spin interaction on the one-dimensional lattice},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {63--76},
     publisher = {mathdoc},
     volume = {133},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_133_a4/}
}
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Yu. M. Vorob'ev; S. Yu. Dobrokhotov; V. P. Maslov. Quasiclassical approximation for the models of spin-spin interaction on the one-dimensional lattice. Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part VI, Tome 133 (1984), pp. 63-76. http://geodesic.mathdoc.fr/item/ZNSL_1984_133_a4/