Geodesic
The hyperbolic Heisenberg and sigma models in $1+1$ dimensions
Teoretičeskaâ i matematičeskaâ fizika, Tome 122 (2000) no. 2, pp. 310-320

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Hyperbolic versions of the integrable $(1+1)$-dimensional Heisenberg ferromagnet and sigma models are discussed in the context of topological solutions classifiable by an integer “winding number”. Some explicit solutions are presented, and the existence of certain classes of such winding solutions is examined. 
@article{TMF_2000_122_2_a13,
     author = {A. E. Winn},
     title = {The hyperbolic {Heisenberg} and sigma models in $1+1$ dimensions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {310--320},
     publisher = {mathdoc},
     volume = {122},
     number = {2},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2000_122_2_a13/}
}
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A. E. Winn. The hyperbolic Heisenberg and sigma models in $1+1$ dimensions. Teoretičeskaâ i matematičeskaâ fizika, Tome 122 (2000) no. 2, pp. 310-320. http://geodesic.mathdoc.fr/item/TMF_2000_122_2_a13/