Geodesic
Local conservation laws of principal chiral fields $(d=1)$
Teoretičeskaâ i matematičeskaâ fizika, Tome 38 (1979) no. 2, pp. 179-185

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The Bäcklund transformation is found and local conservation laws obtained for the principal chiral $O_n$ fields $(d=1)$. 
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     author = {I. V. Cherednik},
     title = {Local conservation laws of principal chiral fields $(d=1)$},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {179--185},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1979_38_2_a3/}
}
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I. V. Cherednik. Local conservation laws of principal chiral fields $(d=1)$. Teoretičeskaâ i matematičeskaâ fizika, Tome 38 (1979) no. 2, pp. 179-185. http://geodesic.mathdoc.fr/item/TMF_1979_38_2_a3/