Geodesic
Three-magnon problem and integrability of rung-dimerized spin ladders
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 21, Tome 374 (2010), pp. 44-57

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Integrability problem for rung-dimerized spin ladder is studied by coordinate Bethe Ansatz method in three-magnon sector. It is shown that solvability of the three-magnon problem takes place for the same values of coupling constants in the Hamiltonian which guaranty solvability of the Yang–Baxter equation for the corresponding $R$-matrix. Bibl. – 15 titles. 
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     author = {P. N. Bibikov and P. P. Kulish},
     title = {Three-magnon problem and integrability of rung-dimerized spin ladders},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_2010_374_a2/}
}
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P. N. Bibikov; P. P. Kulish. Three-magnon problem and integrability of rung-dimerized spin ladders. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 21, Tome 374 (2010), pp. 44-57. http://geodesic.mathdoc.fr/item/ZNSL_2010_374_a2/