Geodesic
Two-magnon systems in the one-dimensional non-Heisenberg ferromagnet with nearest neighbours and second nearest neighbours interaction with spin value $s=1$
Teoretičeskaâ i matematičeskaâ fizika, Tome 107 (1996) no. 2, pp. 251-261 
S. M. Tashpulatov. Two-magnon systems in the one-dimensional non-Heisenberg ferromagnet with nearest neighbours and second nearest neighbours interaction with spin value $s=1$. Teoretičeskaâ i matematičeskaâ fizika, Tome 107 (1996) no. 2, pp. 251-261. http://geodesic.mathdoc.fr/item/TMF_1996_107_2_a6/
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     author = {S. M. Tashpulatov},
     title = {Two-magnon systems in the one-dimensional {non-Heisenberg} ferromagnet with nearest neighbours and second nearest neighbours interaction with spin value $s=1$},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {251--261},
     year = {1996},
     volume = {107},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1996_107_2_a6/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Two-magnon systems in the one-dimensional non-Heisenberg ferromagnet with nearest neighbours and second nearest neighbours interactions with a spin value $s=1$ are considered. It is shown that under $\Lambda=\pi $ and $\Lambda=0$ the system has no more than two, and under $\Lambda=\pi /2$ no more than six two-magnon bound states respectively.

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