Geodesic
Application of~the Lund-Regge method to~the chiral $CP(n)$ model
Teoretičeskaâ i matematičeskaâ fizika, Tome 45 (1980) no. 1, pp. 19-29

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Geometrical method due to Lund and Regge is applied to the chiral $\sigma$-model. Pohlmayer's reduction method is used which gives, in particular, the $\sin$-Gordon and Liouville equations. Relation to gauge theories is considered. 
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     author = {V. L. Golo and B. A. Putko},
     title = {Application of~the {Lund-Regge} method to~the chiral $CP(n)$ model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1980_45_1_a1/}
}
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V. L. Golo; B. A. Putko. Application of~the Lund-Regge method to~the chiral $CP(n)$ model. Teoretičeskaâ i matematičeskaâ fizika, Tome 45 (1980) no. 1, pp. 19-29. http://geodesic.mathdoc.fr/item/TMF_1980_45_1_a1/