Geodesic
Spectrum of Two-Magnon non-Heisenberg Ferromagnetic Model of Arbitrary Spin with Impurity
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 9 (2013) no. 2, pp. 239-265 Cet article a éte moissonné depuis la source Math-Net.Ru

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We consider a two-magnon system in the isotropic non-Heisenberg ferromagnetic model of an arbitrary spin $s$ on a $\nu$-dimensional lattice $Z^{\nu}$. We establish that the essential spectrum of the system consists of the union of at most four intervals. We obtain lower and upper estimates for the number of three-particle bound states, i.e., for the number of points of discrete spectrum of the system. 
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S. M. Tashpulatov. Spectrum of Two-Magnon non-Heisenberg Ferromagnetic Model of Arbitrary Spin with Impurity. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 9 (2013) no. 2, pp. 239-265. http://geodesic.mathdoc.fr/item/JMAG_2013_9_2_a6/

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