Factorization of loop algebras over $\mathrm{so}(4)$ and integrable nonlinear differential equations
Fundamentalʹnaâ i prikladnaâ matematika, Tome 11 (2005) no. 3, pp. 79-94

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We consider factoring subalgebras for loop algebras over $\mathrm{so}(4)$. Given a factoring subalgebra, we find (in terms of coefficients of commutator relations) an explicit form of (1) the corresponding system of the chiral field equation type, (2) the corresponding two-spin model of the Landau–Lifshitz equation, and (3) the corresponding Hamiltonian system of ordinary differential equations with homogeneous quadratic Hamiltonian and linear $\mathrm{so}(4)$-Poisson brackets.
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     author = {O. V. Efimovskaya},
     title = {Factorization of loop algebras over $\mathrm{so}(4)$ and integrable nonlinear differential equations},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {79--94},
     publisher = {mathdoc},
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     number = {3},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2005_11_3_a4/}
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O. V. Efimovskaya. Factorization of loop algebras over $\mathrm{so}(4)$ and integrable nonlinear differential equations. Fundamentalʹnaâ i prikladnaâ matematika, Tome 11 (2005) no. 3, pp. 79-94. http://geodesic.mathdoc.fr/item/FPM_2005_11_3_a4/