Geodesic
The zero-curvature representation for nonlinear $O(3)$ sigma-model
Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part 14, Tome 215 (1994), pp. 100-114

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We consider $O(З)$ sigma-model as a reduction of the principal chiral field. This approach allows to introduce the currents with ultralocal Poisson brackets and to obtain the zero-curvature equation which admits the fundamental Poisson bracket. Bibliography: 5 titles. 
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     author = {A. G. Bytsko},
     title = {The zero-curvature representation for nonlinear $O(3)$ sigma-model},
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     volume = {215},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_1994_215_a5/}
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A. G. Bytsko. The zero-curvature representation for nonlinear $O(3)$ sigma-model. Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part 14, Tome 215 (1994), pp. 100-114. http://geodesic.mathdoc.fr/item/ZNSL_1994_215_a5/