Geodesic
The transformation of Pohlmeyer and $(2+0)$ integrable equations of statistical physics
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 14, Tome 245 (1997), pp. 149-165 Cet article a éte moissonné depuis la source Math-Net.Ru

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Using the transformation of Pohlmeyer in euclidean space it obtained the equation, which provide the possibility to construct the wide class of two-dimensional elliptical integrable systems. The question on a gauge equivalence of this systems with nonlinear sigma-model and Getmanov and Bitzadze models is investigated. The exact solution of some equations are constructed. 
@article{ZNSL_1997_245_a7,
     author = {E. Sh. Gutshabash},
     title = {The transformation of {Pohlmeyer} and $(2+0)$ integrable equations of statistical physics},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {149--165},
     year = {1997},
     volume = {245},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_245_a7/}
}
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E. Sh. Gutshabash. The transformation of Pohlmeyer and $(2+0)$ integrable equations of statistical physics. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 14, Tome 245 (1997), pp. 149-165. http://geodesic.mathdoc.fr/item/ZNSL_1997_245_a7/