A classification of string solutions of the Bethe equations for the $XXZ$ model of arbitrary spin
Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part VII, Tome 146 (1985), pp. 31-46

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The structure of string solutions for the $XXZ$ Heisenbers model of arbitrary spin is studied. Special spin values are found for which there are restrictions on the positions of centers of certain string solutions. For a class of spin values depending on the asnisothropy parameter such restrictions do not occur. A conjecture on the full classification of string states over the ferromagnetic vacuum is formulated. Bibl. – 14.
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     author = {A. N. Kirillov and N. Yu. Reshetikhin},
     title = {A classification of string solutions of the {Bethe} equations for the $XXZ$ model of arbitrary spin},
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     publisher = {mathdoc},
     volume = {146},
     year = {1985},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_146_a3/}
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A. N. Kirillov; N. Yu. Reshetikhin. A classification of string solutions of the Bethe equations for the $XXZ$ model of arbitrary spin. Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part VII, Tome 146 (1985), pp. 31-46. http://geodesic.mathdoc.fr/item/ZNSL_1985_146_a3/