Geodesic
On the Poisson structure for the matrix Sine--Gordon equation
Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part VII, Tome 146 (1985), pp. 3-8

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Equal-time Poisson brackets are computed for currents in the two dimensional relativistic model generalizing the Sine–Gordon equation to the matrix case. Special attention is given to the contribution from the so called Wess–Zumlno term. Bibl. – 8. 
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N. M. Bogolyubov; A. S. Budagov. On the Poisson structure for the matrix Sine--Gordon equation. Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part VII, Tome 146 (1985), pp. 3-8. http://geodesic.mathdoc.fr/item/ZNSL_1985_146_a0/